Catch Exceptions handled by External Assembly

Is it possible to catch Exceptions that are handled by an external (legacy) Assembly?

I don't think I can catch those exceptions since they are already handled, but similarly to Visual Studio "break on all exceptions" I thought that maybe I could at least get some notification about the exception.

e.g.: MyProduct.exe calls Utils.dll and Utils.dll is swallowing all exceptions, and doesn't return any information if something wrong happened.

PS: Modifying that external assembly is obviously an alternative, but it's very hard because it's actually spread across hundreds of customized copies