Yes, exactly, since WINE uses superuser by default there's no way to apply the most common fix to "Failed to retrieve process" problem that I ran into trying to get it work on MacOS.
Funnily enough, I get the same exact error trying to run same D2 folder (Sigma installed over base game files, no PlugY, no D2SE) on Win7 virtual machine.
It is, as expected, solved by "Run as administrator".
Since I'm not an expert on low-level debugging I can't point out what the exact problem is.
Also, I've (barely) managed to get MXL Launcher working, battling through exceptions popping up, but the problem I'm having exactly the same problem.
"Failed to retrieve process" when running via either:
- launcher on Wine
- "Diablo II.exe" on Wine
- "Diablo 2.exe" on Win7 without "Run as administrator"
I'll probably do that just to play D2, but this is extreme overkill and (as @Solfege said) waste of money and resources.
Let's hope it does work with D2SE or there is a workaround, because booting into Win10 for just one game is kind of ridiculous.
Things you do for love (for Sigma).