https://bugs.winehq.org/show_bug.cgi?id=52761
--- Comment #32 from Esme Povirk madewokherd@gmail.com --- Any program can call c:\windows\microsoft.net...\csc.exe. csc-wrapper.cs gets compiled and installed there as a replacement. So programs will call csc-wrapper directly as csc.exe, the way the mscoree test does, and csc-wrapper works by calling mcs.exe.