And don’t forget that syswow64 is where 32-bit os programs are, system32 is where the 64-bit programs are… and I guess system is still for 16-bit OS programs, if there still are any.
(Edit: just checked, it seems to have only xsd documents for windows speech synthesis.)
Also the two Program Files folders that have existed since the switch to 64-bit systems.
And third-party software installers that install stuff into their own secret places. Like Steam games.
And don’t forget that syswow64 is where 32-bit os programs are, system32 is where the 64-bit programs are… and I guess system is still for 16-bit OS programs, if there still are any.
(Edit: just checked, it seems to have only xsd documents for windows speech synthesis.)