You can send the minidumps to me or jon via a private message, or email them to leo@gpsoft.com.au
Crashes are usually caused by certain files or filetypes triggering bugs in 3rd party shell extensions or video codecs (e.g. when generating thumbnails or extracting details from movie files). The Other Troubleshooting section of the Opus FAQ has some guides to locating the problem which may be useful, depending on when it happens.