get-msOfficeInstallationRoot of the PowerShell module MS-Office returns the root directory of a Microsoft Office installation. EXCEL.EXE, WINWORD.EXE etc. as well as those of some helper programs such as SELFCERT.EXE). get-msOfficeInstallationRoot is used to locate the path of SPREADSHEETCOMPARE.EXE in the PowerShell script compare-spreadsheets.ps1.