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VIM: runtime

The variable $VIMRUNTIME should point to the root of the runtime files.
Files and subdirectories include
autoload/
doc/ Helpfiles
plugin/
defaults.vim Loaed if no vimrc file was found and if vim is started with -u NONE or -C. (See also E1187: Failed to source defaults.vim)
filetype.vim detect file types
menu.vim definition of the default menus
optwin.vim commands to create the option window.

Maintenance

The files under /runtime are maintained by various maintainers, not by the vim project.
So, bug reports etc. need to be directed to the maintainers directly.

See also

src/scriptfile.c contains functions for dealing with the runtime directories/files.
vim_version_dir() in misc1.c
The directory name of the runtime files is assigned to the macro RUNTIME_DIRNAME (src/feature.h) (typically "runtime"), compare with the value of the macro DFLT_RUNTIMEPATH.

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