Interesting indeed. Until now, they published all LucasArts adventures as actual Windows ports, iIrc. No one understood why they went through this effort after all those years when ScummVM was already there doing a great job, and cross platform.
Not exactly “all of MM”, but people always mentioned DOTT since it simply was the only way to get it legally for a long time.
They were in the original DOS version.
And be aware when trying to play the German version of Maniac Mansion on actual DOS: The mailbox does not work in any version with the code protection removed. ScummVM does not have this bug.