https://bugs.winehq.org/show_bug.cgi?id=57494
--- Comment #4 from Louis Lenders xerox.xerox2000x@gmail.com --- (In reply to Dmitry Timoshkov from comment #3)
Probably Windows doesn't look for gdiplus.dll under system32/syswow64, but uses a manifest and winsxs, and that might explain it.
I ran the installer in a Windows virtual machine (windows 10) and there the app does not install it's own gdiplus, neither in system32 nor in syswow64.
I think the installer checks the version of gdiplus, because when I update wine's gdiplus version from 6.1.*** to 10.1*** wine doesn't install gdiplus anymore (in syswow64) and the application starts fine.
I don't have a windows 7 VM; If anyone has, it would be interesting to see if the installer also installs the 64-bit gdiplus into syswow64 on that VM;
For now it's not clear if this is an application bug or a wine bug...