https://bugs.winehq.org/show_bug.cgi?id=47955
--- Comment #4 from Ben R divestoclimb@gmail.com --- I figured out the crash, it was due to me using an old version of winetricks (Ubuntu supplied 0.0+20180217-1) to install dotnet45. With the latest winetricks I get the same result as you.
When running with wine-mono, I don't have either Vminteq17 or Vmindefault functional. Vmindefault appears to be okay except when hitting "Save and Quit" it produces another error, and I don't think any of the settings get saved (I wish I knew what file they were supposed to be kept in; I think it's supposed to have a .dat extension in Documents/Vminteq31). Vminteq17 produces an error message and fails to populate a lot of the form (dropdowns for instance), making it unusable. This is probably related to its inability to find the file "Documents/Vminteq31/userfolder.txt" that tells it where to find all the databases and other customizable files.
In dotnet45, the rest of the app appears to function adequately with the exception of this one defaults part.
Sorry about the confusion. Is this report still proper?