Search notes:

%FrameworkDir%%FrameWorkVersion%

A typical value for the Visual Studio environment variable FrameworkDir might be C:\Windows\Microsoft.NET\Framework\ (Framework64?).
The value of FrameWorkVersion apparently is either v1.0.3705, v1.1.4322, v2.0.50727 or v4.0.30319. v3.0 and v3.5 contain additional assemblies to v2.0.50727.
Thus, the full path is something like C:\Windows\Microsoft.NET\Framework\v4.0.30319 (or C:\Windows\Microsoft.NET\Framework64\v4.0.30319 ?)
The path of this directory might be returned in PowerShell with 
[Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory()

Some files that might be found

Some files that might be found under %SystemRoot%\Microsoft.NET\vn.n.nnnnn. (Almost the equal set of files is also in the parallel directory under %SystemRoot%\Microsoft.NET\Framework\vn.n.n)
Accessibility.dll .NET Framework
AddInProcess.exe AddInProcess.exe
AddInProcess.exe.config
AddInProcess32.exe AddInProcess.exe
AddInProcess32.exe.config
AddInUtil.exe AddInUtil.exe
AddInUtil.exe.config
AdoNetDiag.dll .NET Framework
adonetdiag.mof
adonetdiag.mof.uninstall
alink.dll Assembly Linker
AppLaunch.exe Microsoft .NET ClickOnce Launch Utility
applaunch.exe.config
Aspnet.config
aspnet_compiler.exe aspnet_compiler.exe
aspnet_filter.dll Microsoft ASP.NET ISAPI Filter DLL
aspnet_isapi.dll Microsoft ASP.NET ISAPI Shim DLL
Aspnet_perf.dll Microsoft ASP.NET Performance Counter DLL
aspnet_perf.h
aspnet_perf.ini
aspnet_perf2.ini
aspnet_rc.dll aspnet_rc.dll
aspnet_regbrowsers.exe aspnet_regbrowsers.exe
aspnet_regiis.exe aspnet_regiis.exe
aspnet_regsql.exe aspnet_regsql.exe
aspnet_state.exe Microsoft ASP.NET State Server
aspnet_state_perf.h
aspnet_state_perf.ini
aspnet_wp.exe aspnet_wp.exe
CasPol.exe Microsoft .NET Framework CAS Policy Manager
caspol.exe.config
clientexclusionlist.xml
CLR-ETW.man
clr.dll Microsoft .NET Runtime Common Language Runtime - WorkStation
clrcompression.dll Native data compression routines
clretwrc.dll Microsoft .NET Runtime resources
clrjit.dll Microsoft .NET Runtime Just-In-Time Compiler
compatjit.dll Microsoft .NET Runtime Just-In-Time Compiler
ComSvcConfig.exe ComSvcConfig.exe
CORPerfMonExt.dll Microsoft Common Language Runtime - Performance Counter DLL
csc.exe Visual C# Command Line Compiler for C# 5 (for newer versions see Roslyn .NET compiler)
csc.exe.config
csc.rsp Default command line options for csc.exe (unless invoked with -noconfig).
Culture.dll Microsoft Globalization Support
CustomMarshalers.dll Microsoft .NET Framework Custom Marshalers
cvtres.exe Microsoft® Resource File To COFF Object Conversion Utility
cvtres.exe.config
DataSvcUtil.exe DataSvcUtil.exe
DataSvcUtil.exe.config
default.win32manifest
dfdll.dll Application Deployment Shell Support
dfsvc.exe ClickOnce
dfsvc.exe.config
diasymreader.dll Dia based SymReader
dv_aspnetmmc.chm
EdmGen.exe Command line tool for working with Entity Framework model and mapping files.
EventLogMessages.dll EventLogMessages.dll
FileTracker.dll FileTracker
fusion.dll Assembly manager
FXUpdate.dat
ilasm.exe Microsoft .NET Framework IL assembler
ilasm.exe.config
InstallCommon.sql
InstallMembership.sql
InstallPersistSqlState.sql
InstallPersonalization.sql
InstallProfile.SQL
InstallRoles.sql
InstallSqlState.sql
InstallSqlStateTemplate.sql
InstallUtil.exe .NET Framework installation utility
InstallUtil.exe.config
InstallUtilLib.dll Managed Installer Object
InstallWebEventSqlProvider.sql
ISymWrapper.dll Microsoft .NET Runtime Managed Symbol Wrappers
jsc.exe JScript .NET compiler
jsc.exe.config
locale.nlp
Microsoft.Activities.Build.dll Microsoft.Activities.Build.dll
Microsoft.Build.Conversion.v4.0.dll Microsoft.Build.Conversion.v4.0.dll
Microsoft.Build.dll Microsoft.Build.dll
Microsoft.Build.Engine.dll Microsoft.Build.Engine.dll
Microsoft.Build.Framework.dll Microsoft.Build.Framework.dll
Microsoft.Build.Tasks.v4.0.dll Microsoft.Build.Tasks.v4.0.dll
Microsoft.Build.Utilities.v4.0.dll Microsoft.Build.Utilities.v4.0.dll
Microsoft.Build.xsd
Microsoft.Common.OverrideTasks
Microsoft.Common.targets
Microsoft.Common.Tasks
Microsoft.CSharp.dll Microsoft.CSharp.dll
Microsoft.CSharp.targets
Microsoft.Data.Entity.Build.Tasks.dll Microsoft.Data.Entity.Build.Tasks.dll
Microsoft.Data.Entity.targets
Microsoft.Internal.Tasks.Dataflow.dll .NET Framework
Microsoft.JScript.dll Microsoft.JScript.dll
Microsoft.JScript.tlb UNKNOWN_FILE
Microsoft.NETFramework.props
Microsoft.NETFramework.targets
Microsoft.ServiceModel.targets
Microsoft.Transactions.Bridge.dll Microsoft.Transactions.Bridge.dll
Microsoft.Transactions.Bridge.Dtc.dll Microsoft DTC Gateway Pluggable Protocol Layer
Microsoft.VisualBasic.Activities.Compiler.dll Visual Basic Hosted Compiler
Microsoft.VisualBasic.Compatibility.Data.dll Visual Basic Compatibility Runtime Library
Microsoft.VisualBasic.Compatibility.dll Visual Basic Compatibility Runtime Library
Microsoft.VisualBasic.dll Visual Basic Runtime Library
Microsoft.VisualBasic.targets
Microsoft.VisualC.Dll Microsoft® Visual C++ Metadata
Microsoft.VisualC.STLCLR.dll Microsoft® C Runtime Library
Microsoft.Win32.Primitives.dll Microsoft.Win32.Primitives
Microsoft.Windows.ApplicationServer.Applications.45.man
Microsoft.Windows.ApplicationServer.Applications.dll Microsoft.Windows.ApplicationServer.Applications.dll
Microsoft.WinFx.targets
Microsoft.Workflow.Compiler.exe Microsoft.Workflow.Compiler.exe
Microsoft.Workflow.Compiler.exe.config
Microsoft.WorkflowBuildExtensions.targets
Microsoft.Xaml.targets
MmcAspExt.dll Microsoft ASP.NET Support DLL
MSBuild.exe MSBuild.exe
msbuild.exe.config
MSBuild.rsp
mscordacwks.dll Microsoft .NET External Data Access Support
mscordbi.dll Microsoft .NET Runtime Debugging Services
mscoree.tlb Microsoft .NET Runtime CLR Loading and Configuration Interfaces
mscoreei.dll Microsoft .NET Runtime Execution Engine
mscoreeis.dll Microsoft .NET Runtime Execution Engine
mscorlib.dll Microsoft Common Language Runtime Class Library
mscorlib.tlb
mscorpe.dll Microsoft .NET Runtime PE File Generator
mscorpehost.dll Microsoft .NET Runtime PE File Generator
mscorrc.dll Microsoft .NET Runtime resources
mscorsecimpl.dll Microsoft .NET Security module
mscorsn.dll Microsoft .NET Strong Name Support
mscorsvc.dll .NET Runtime Optimization Service
mscorsvw.exe .NET Runtime Optimization Service
netstandard.dll netstandard
ngen.exe Microsoft Common Language Runtime native compiler
ngen.log
ngentask.exe Microsoft .NET Framework optimization service
ngentasklauncher.dll Microsoft .NET Framework optimization service
normidna.nlp
normnfc.nlp
normnfd.nlp
normnfkc.nlp
normnfkd.nlp
PerfCounter.dll Microsoft performance counter extension for .NET Runtime
peverify.dll Microsoft .NET Runtime Just-In-Time Compiler
RegAsm.exe Microsoft .NET Assembly Registration Utility
regasm.exe.config
RegSvcs.exe Microsoft .NET Services Installation Utility
regsvcs.exe.config
SbsNclPerf.dll Microsoft .NET Framework v1.0 compatibility
ServiceModelEvents.dll ServiceModel related event descriptions
ServiceModelInstallRC.dll Service Model Installer Resource Library
ServiceModelPerformanceCounters.dll ServiceModelPerformanceCounters.dll
ServiceModelPerformanceCounters.man
ServiceModelReg.exe WCF Generic Command for Vista Setup
ServiceModelRegUI.dll Service Model Installer Resource Library
ServiceMonikerSupport.dll Microsoft Service Moniker Helper
SMDiagnostics.dll SMDiagnostics.dll
SMSvcHost.exe SMSvcHost.exe
SMSvcHost.exe.config
SOS.dll Microsoft NTSD extension for .NET Runtime
sysglobl.dll System.Globalization.dll
System.Activities.Core.Presentation.dll System.Activities.Core.Presentation.dll
System.Activities.dll System.Activities.dll
System.Activities.DurableInstancing.dll System.Activities.DurableInstancing.dll
System.Activities.Presentation.dll System.Activities.Presentation.dll
System.AddIn.Contract.dll .NET Framework
System.AddIn.dll .NET Framework
System.AppContext.dll System.AppContext
System.Collections.Concurrent.dll System.Collections.Concurrent
System.Collections.dll System.Collections
System.Collections.NonGeneric.dll System.Collections.NonGeneric
System.Collections.Specialized.dll System.Collections.Specialized
System.ComponentModel.Annotations.dll System.ComponentModel.Annotations
System.ComponentModel.Composition.dll System.ComponentModel.Composition.dll
system.componentmodel.composition.registration.dll System.ComponentModel.Composition.Registration.dll
System.ComponentModel.DataAnnotations.dll System.ComponentModel.DataAnnotations.dll
System.ComponentModel.dll System.ComponentModel
System.ComponentModel.EventBasedAsync.dll System.ComponentModel.EventBasedAsync
System.ComponentModel.Primitives.dll System.ComponentModel.Primitives
System.ComponentModel.TypeConverter.dll System.ComponentModel.TypeConverter
System.Configuration.dll System.Configuration.dll
System.Configuration.Install.dll .NET Framework
System.Console.dll System.Console
System.Core.dll .NET Framework
System.Data.Common.dll System.Data.Common
System.Data.DataSetExtensions.dll .NET Framework
System.Data.dll .NET Framework
System.Data.Entity.Design.dll System.Data.Entity.Design.dll
System.Data.Entity.dll .NET Framework
System.Data.Linq.dll System.Data.Linq.dll
System.Data.OracleClient.dll .NET Framework
System.Data.Services.Client.dll System.Data.Services.Client.dll
System.Data.Services.Design.dll System.Data.Services.Design.dll
System.Data.Services.dll System.Data.Services.dll
System.Data.SqlXml.dll .NET Framework
System.Deployment.dll System.Deployment.dll
System.Design.dll .NET Framework
System.Device.dll .NET Framework
System.Diagnostics.Contracts.dll System.Diagnostics.Contracts
System.Diagnostics.Debug.dll System.Diagnostics.Debug
System.Diagnostics.FileVersionInfo.dll System.Diagnostics.FileVersionInfo
System.Diagnostics.Process.dll System.Diagnostics.Process
System.Diagnostics.StackTrace.dll System.Diagnostics.StackTrace
System.Diagnostics.TextWriterTraceListener.dll System.Diagnostics.TextWriterTraceListener
System.Diagnostics.Tools.dll System.Diagnostics.Tools
System.Diagnostics.TraceSource.dll System.Diagnostics.TraceSource
System.Diagnostics.Tracing.dll .NET Framework
System.DirectoryServices.AccountManagement.dll .NET Framework
System.DirectoryServices.dll .NET Framework
System.DirectoryServices.Protocols.dll .NET Framework
System.dll .NET Framework
System.Drawing.Design.dll .NET Framework
System.Drawing.dll .NET Framework
System.Drawing.Primitives.dll System.Drawing.Primitives
System.Drawing.tlb .NET Framework
System.Dynamic.dll System.Dynamic.dll
System.Dynamic.Runtime.dll System.Dynamic.Runtime
System.EnterpriseServices.dll Microsoft .NET Services Support Infrastructure
System.EnterpriseServices.Thunk.dll Microsoft .NET Services Native Thunks
System.EnterpriseServices.tlb .NET Framework
System.EnterpriseServices.Wrapper.dll Microsoft .NET Services Native Thunks
System.Globalization.Calendars.dll System.Globalization.Calendars
System.Globalization.dll System.Globalization
System.Globalization.Extensions.dll System.Globalization.Extensions
System.IdentityModel.dll System.IdentityModel.dll
System.IdentityModel.Selectors.dll System.IdentityModel.Selectors.dll
System.IdentityModel.Services.dll System.IdentityModel.Services.dll
System.IO.Compression.dll .NET Framework
System.IO.Compression.FileSystem.dll System.IO.Compression.FileSystem.dll
System.IO.Compression.ZipFile.dll System.IO.Compression.ZipFile
System.IO.dll System.IO
System.IO.FileSystem.dll System.IO.FileSystem
System.IO.FileSystem.DriveInfo.dll System.IO.FileSystem.DriveInfo
System.IO.FileSystem.Primitives.dll System.IO.FileSystem.Primitives
System.IO.FileSystem.Watcher.dll System.IO.FileSystem.Watcher
System.IO.IsolatedStorage.dll System.IO.IsolatedStorage
System.IO.Log.dll System.IO.Log.dll
System.IO.MemoryMappedFiles.dll System.IO.MemoryMappedFiles
System.IO.Pipes.dll System.IO.Pipes
System.IO.UnmanagedMemoryStream.dll System.IO.UnmanagedMemoryStream
System.Linq.dll System.Linq
System.Linq.Expressions.dll System.Linq.Expressions
System.Linq.Parallel.dll System.Linq.Parallel
System.Linq.Queryable.dll System.Linq.Queryable
System.Management.dll .NET Framework
System.Management.Instrumentation.dll .NET Framework
System.Messaging.dll .NET Framework
System.Net.dll System.Net.dll
System.Net.Http.dll .NET Framework
System.Net.Http.Rtc.dll System.Net.Http.Rtc.dll
System.Net.Http.WebRequest.dll .NET Framework
System.Net.NameResolution.dll System.Net.NameResolution
System.Net.NetworkInformation.dll System.Net.NetworkInformation
System.Net.Ping.dll System.Net.Ping
System.Net.Primitives.dll System.Net.Primitives
System.Net.Requests.dll System.Net.Requests
System.Net.Security.dll System.Net.Security
System.Net.Sockets.dll System.Net.Sockets
System.Net.WebHeaderCollection.dll System.Net.WebHeaderCollection
System.Net.WebSockets.Client.dll System.Net.WebSockets.Client
System.Net.WebSockets.dll System.Net.WebSockets
System.Numerics.dll .NET Framework
System.Numerics.Vectors.dll .NET Framework
System.ObjectModel.dll System.ObjectModel
System.Reflection.context.dll System.Reflection.Context.dll
System.Reflection.dll System.Reflection
System.Reflection.Emit.dll System.Reflection.Emit
System.Reflection.Emit.ILGeneration.dll System.Reflection.Emit.ILGeneration.dll
System.Reflection.Emit.Lightweight.dll System.Reflection.Emit.Lightweight.dll
System.Reflection.Extensions.dll System.Reflection.Extensions
System.Reflection.Primitives.dll System.Reflection.Primitives
System.Resources.Reader.dll System.Resources.Reader
System.Resources.ResourceManager.dll System.Resources.ResourceManager
System.Resources.Writer.dll System.Resources.Writer
System.Runtime.Caching.dll System.Runtime.Caching.dll
System.Runtime.CompilerServices.VisualC.dll System.Runtime.CompilerServices.VisualC
System.Runtime.dll System.Runtime
System.Runtime.DurableInstancing.dll System.Runtime.DurableInstancing.dll
System.Runtime.Extensions.dll System.Runtime.Extensions
System.Runtime.Handles.dll System.Runtime.Handles
System.Runtime.InteropServices.dll System.Runtime.InteropServices
System.Runtime.InteropServices.RuntimeInformation.dll System.Runtime.InteropServices.RuntimeInformation
System.Runtime.InteropServices.WindowsRuntime.dll System.Runtime.InteropServices.WindowsRuntime.dll
System.Runtime.Numerics.dll System.Runtime.Numerics
System.Runtime.Remoting.dll Microsoft .NET Runtime Object Remoting
System.Runtime.Serialization.dll System.Runtime.Serialization.dll
System.Runtime.Serialization.Formatters.dll System.Runtime.Serialization.Formatters
System.Runtime.Serialization.Formatters.Soap.dll Microsoft .NET Runtime Soap Serialization Library
System.Runtime.Serialization.Json.dll System.Runtime.Serialization.Json
System.Runtime.Serialization.Primitives.dll System.Runtime.Serialization.Primitives
System.Runtime.Serialization.Xml.dll System.Runtime.Serialization.Xml
System.Runtime.WindowsRuntime.dll .NET Framework
System.Runtime.WindowsRuntime.UI.Xaml.dll .NET Framework
System.Security.Claims.dll System.Security.Claims
System.Security.Cryptography.Algorithms.dll System.Security.Cryptography.Algorithms
System.Security.Cryptography.Csp.dll System.Security.Cryptography.Csp
System.Security.Cryptography.Encoding.dll System.Security.Cryptography.Encoding
System.Security.Cryptography.Primitives.dll System.Security.Cryptography.Primitives
System.Security.Cryptography.X509Certificates.dll System.Security.Cryptography.X509Certificates
System.Security.dll System.Security.dll
System.Security.Principal.dll System.Security.Principal
System.Security.SecureString.dll System.Security.SecureString
System.ServiceModel.Activation.dll System.ServiceModel.Activation.dll
System.ServiceModel.Activities.dll System.ServiceModel.Activities.dll
System.ServiceModel.Channels.dll System.ServiceModel.Channels.dll
System.ServiceModel.Discovery.dll System.ServiceModel.Discovery.dll
System.ServiceModel.dll System.ServiceModel.dll
System.ServiceModel.Duplex.dll System.ServiceModel.Duplex.dll
System.ServiceModel.Http.dll System.ServiceModel.Http
System.ServiceModel.Internals.dll System.ServiceModel.Internals.dll
System.ServiceModel.NetTcp.dll System.ServiceModel.NetTcp.dll
System.ServiceModel.Primitives.dll System.ServiceModel.Primitives.dll
System.ServiceModel.Routing.dll System.ServiceModel.Routing.dll
System.ServiceModel.Security.dll System.ServiceModel.Security.dll
System.ServiceModel.ServiceMoniker40.dll System.ServiceModel.ServiceMoniker40.dll
System.ServiceModel.WasHosting.dll System.ServiceModel.WasHosting.dll
System.ServiceModel.Web.dll System.ServiceModel.Web.dll
System.ServiceProcess.dll .NET Framework
System.Text.Encoding.dll System.Text.Encoding
System.Text.Encoding.Extensions.dll System.Text.Encoding.Extensions
System.Text.RegularExpressions.dll System.Text.RegularExpressions
System.Threading.dll System.Threading
System.Threading.Overlapped.dll System.Threading.Overlapped
System.Threading.Tasks.dll System.Threading.Tasks
System.Threading.Tasks.Parallel.dll System.Threading.Tasks.Parallel
System.Threading.Thread.dll System.Threading.Thread
System.Threading.ThreadPool.dll System.Threading.ThreadPool
System.Threading.Timer.dll System.Threading.Timer
System.tlb .NET Framework
System.Transactions.dll .NET Framework
System.ValueTuple.dll System.ValueTuple
System.Web.Abstractions.dll System.Web.Abstractions.dll
System.Web.ApplicationServices.dll System.Web.ApplicationServices.dll
System.Web.DataVisualization.Design.dll System.Web.DataVisualization.Design.dll
System.Web.DataVisualization.dll System.Web.DataVisualization.dll
System.Web.dll System.Web.dll
System.Web.DynamicData.Design.dll System.Web.DynamicData.Design.dll
System.Web.DynamicData.dll System.Web.DynamicData.dll
System.Web.Entity.Design.dll .NET Framework
System.Web.Entity.dll .NET Framework
System.Web.Extensions.Design.dll System.Web.Extensions.Design.dll
System.Web.Extensions.dll System.Web.Extensions.dll
System.Web.Mobile.dll System.Web.Mobile.dll
System.Web.RegularExpressions.dll System.Web.RegularExpressions.dll
System.Web.Routing.dll System.Web.Routing.dll
System.Web.Services.dll .NET Framework
System.Web.tlb .NET Framework
System.Windows.dll System.Windows.dll
System.Windows.Forms.DataVisualization.Design.dll System.Windows.Forms.DataVisualization.Design.dll
System.Windows.Forms.DataVisualization.dll System.Windows.Forms.DataVisualization.dll
System.Windows.Forms.dll .NET Framework
System.Windows.Forms.tlb .NET Framework
System.Workflow.Activities.dll System.Workflow.Activities.dll
System.Workflow.ComponentModel.dll System.Workflow.ComponentModel.dll
System.Workflow.Runtime.dll System.Workflow.Runtime.dll
System.WorkflowServices.dll System.WorkflowServices.dll
System.Xaml.dll System.Xaml.dll
System.Xaml.Hosting.dll System.Xaml.Hosting.dll
System.XML.dll .NET Framework
System.Xml.Linq.dll .NET Framework
System.Xml.ReaderWriter.dll System.Xml.ReaderWriter
System.Xml.Serialization.dll System.Xml.Serialization.dll
System.Xml.XDocument.dll System.Xml.XDocument
System.Xml.XmlDocument.dll System.Xml.XmlDocument
System.Xml.XmlSerializer.dll System.Xml.XmlSerializer
System.Xml.XPath.dll System.Xml.XPath
System.Xml.XPath.XDocument.dll System.Xml.XPath.XDocument
ThirdPartyNotices.txt
TLBREF.DLL Microsoft OleAut helper APIs
UninstallCommon.sql
UninstallMembership.sql
UninstallPersistSqlState.sql
UninstallPersonalization.sql
UnInstallProfile.SQL
UninstallRoles.sql
UninstallSqlState.sql
UninstallSqlStateTemplate.sql
UninstallWebEventSqlProvider.sql
vbc.exe Visual Basic Command Line Compiler
vbc.exe.config
vbc.rsp
webengine.dll Microsoft ASP.NET ISAPI Shim DLL
webengine4.dll Microsoft ASP.NET Support DLL
WMINet_Utils.dll WMINet_Utils.dll
Workflow.Targets
Workflow.VisualBasic.Targets
WorkflowServiceHostPerformanceCounters.dll WorkflowServiceHostPerformanceCounters.dll
WorkflowServiceHostPerformanceCounters.man
WsatConfig.exe MB Version update tool
XamlBuildTask.dll XamlBuildTask.dll
XPThemes.manifest
XsdBuildTask.dll XsdBuildTask.dll

See also

%SystemRoot%\Microsoft.NET\Framework64

Index