“Behind the Scenes on How Windows 95 Application Compatibility Patched Broken Programs”:
On very rare occasions, the problem is too deeply embedded in the program, and the only reasonable option is to patch it. Out of safety, the Windows 95 team got written permission from the vendor whenever they needed to patch a program. The consultation included detailed information on what the problem was and how it was going to be patched. In exchange, the team requested information from the vendor on what versions of their product are affected (and if they could send those versions for analysis), as well as a promise to fix the problem in their next version, because the next version won’t have the benefit of the patch.