Returns the content of a file.
Beware of casing -- some filesystems are case-sensitive. SRCDS on Linux seems to force file/directory creation to lowercase, but will not modify read operations.
GAMEStructured like base folder (garrysmod/), searches all the mounted content (main folder, addons, mounted games etc)
lsv- All Lua folders (lua/) including gamesmodes and addons
DATAData folder (garrysmod/data)
MODStrictly the game folder (garrysmod/), ignores mounting.
It can also be a boolean: