That sounds unrelated to the OP's gdimm_64.dll crash.
It's most likely triggered by a particular file (or type of file) within the folder you're double-clicking (or potentially the one you came from) which in turn is triggering a bug either in Opus itself or (more commonly) in a shell extension or similar DLL something else has installed.
If there aren't any crash dumps then the best thing to do is split up the contents of the folder you're going into to see if you can narrow it down to a particular file. Disabling shell extensions is also a good thing to try. Both are described in more detail in Crash, exit or high CPU when viewing certain directories