Also, it is true that Windows Setup would replace old bundled applications with the upgraded versions (otherwise it wouldn't really be an upgrade,) but if you h

Also, it is true that Windows Setup would replace old bundled applications with the upgraded versions (otherwise it wouldn't really be an upgrade,) but if you had older applications that didn't come with the new OS (REVERSI.EXE was no longer available in Windows 3.1, there was no CARDFILE.EXE in Windows 95, and so forth) Setup would just leave them alone, and they would run happily on the new OS. There were some exceptions to this; I remember as a kid upgrading my 486 from Windows 3.1 to 95 for the first time, and being disappointed that Setup replaced Paintbrush and Write with Paint and Wordpad, because I liked Paintbrush better. It actually replaced PBRUSH.EXE and WRITE.EXE with dummy EXE:s that would just launch MSPAINT.EXE and WORDPAD.EXE instead. These dummy files are still in recent Windows versions for compatibility with stuff like ancient apps that create shortcuts to launch Write with their docs. It was trivial to retrieve PBRUSH.EXE from Windows 3.1 install media, however, and it works fine on Windows 95 as well as every subsequent 32-bit Windows.