Think about +x always for windows installables

https://wiki.samba.org/index.php/Setting_up_a_Share_Using_POSIX_ACLs#Making_Files_Executable

I've manually +x'ed everything recursively at the moment (so also .txt files etc), so that's basically the same

Not sure what the best way is

Start with the linked Samba guidance on POSIX ACLs and inspect how Windows installables are currently handled. The issue does not name a file, test, or entry point; clarify which files should receive +x and define the intended behavior before changing anything.

Written by the indexing model from the issue text.