I collected my notes about getting msvc4's setup running under Wine at http://www.kegel.com/linux/winelog.html I now have wordpad reading .wri files properly under Wine (needed for the "STL" button). The next problem is that the setup program does ShellExecute(..., "explorer.exe", ".", ...) to pop up an explorer window.
Well, wine has Winefile, but not explorer.exe. It looks like the path of least resistance is for me to write a trivial little explorer.exe that just cd's to argv[1] and fires up winefile (which always operates on the current directory). I've written it, and I expect when I add the needed registry entry, it'll make msvc4's setup's "explore this cd" button work fine.
Anyone think that'd be a bad thing to put into the Wine tree? - Dan