[Bug 50700] New: possible regression? unimplemented function dx7vb.dll.DllRegisterServer in application that ships with own dx7vb.dll

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50700

Bug ID: 50700
           Summary: possible regression? unimplemented function
                    dx7vb.dll.DllRegisterServer in application that ships
                    with own dx7vb.dll
           Product: Wine-staging
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

I have an old application that came with dx7vb.dll. To get it to run in wine, I
had to `regsvr32 dx7vb.dll`. After that, everything worked fine.

After moving to wine-staging, neither the application or regsvr work anymore,
crashing with an unimplemented call to dx7vb.dll.DllRegisterServer.

Adding a native library override for dx7vb.dll didn't seem to work.
I can't provide much info on the application, it's basically vaporware - but it
did work on stable nevertheless.