docs/compilers/CSharp/Win32 Resources.md
The compiler accepts these native resource types:
Specifying either /win32icon or /win32manifest along with /win32res is an error. The user is expected to either supply all of the resources (via /win32res) or parts of them (with the other switches), but the compiler doesn't combine the contents of a user-supplied .RES file with individual resources.
A version resource is added to the output unless /win32res is specified. In the absence of the attributes that affect version numbers, the compiler constructs a default version number.