Some of it is so obsolete and unique it would probably identify the company :) . The rest is slightly less old, MS webforms.

The webforms stuff isn't much better because the code quality is the worst I've ever seen. Adding features and fixing bugs is a stochastic process because you never know what will break.

Usually fixing a bug will expose an old fix that was done improperly for the original even older bug, forcing you to undo multiple levels of hacks to implement your own. It's nightmarish