https://bugs.winehq.org/show_bug.cgi?id=27185
--- Comment #5 from Vincent Povirk madewokherd@gmail.com --- ILASM on windows has a nifty feature where you can pass in /mdv=4.0.20926, or any version you desire. It seems that on windows, any 4.0 revision <= 30319 is accepted.
Unfortunately, Mono's ILASM doesn't support this flag, so I can't easily write a test for this behavior directly.