I experienced a crash a few days back and had another one today 501 and 503 respectively. Both times I was trying to add file extensions to the "Archive" file type in the file type editor. IF you need anything else from me let me know.
Still no luck with WinRAR, pretty much just given up on it.
Can you tell us the steps to reproduce the crash?
It looks like a crash in the Windows combobox control, which is strange as it's not our code. But maybe there is a sequence of actions that puts it into an invalid state or something.
From what I remember I was in the file extension window. I went down to the Rar extension saw that it wasn't marked "archive" so I did. Then did the same forZip, Zipx, and then Z. When i selected Archive from the drop down menu for Z, the second i clicked Archive within the menu it crashed with the window.