I uploaded a new version of MobiHandler: version 1.1.1201. As always, it is on SkyDrive
and the file name is mobihandler-1-1-1201-setup.msi.
This version should work with both Kindle for PC version 1.4 and 1.5. Some other bugs are also fixed, including GeoffC's. alansplace's and Onemack's are still open, though.
I again adjusted slightly 64 bit operations. I hope it improves compatibility with 64 bit OS. However, I notice that some strange cover-image-unavailable problem on 64 bit, sometimes. I want to see more feedbacks on this issue.