So, after a lot of in-depth digging, it appears that QT 5.2.1/MinGW 4.8 DOES support what we need for Windows 7/8 API calls. A new build is currently being tested and will soon come up, along with an installer. This release is only to test the new build environment, along with the installer. There are still several bugs that are open, some are critical. These are our top priority for 1.0 (before any additional features).
To those that have lost their boot drives, all I can say is sorry. We try to do fairly extensive testing before release, but we can't cover all situations (I just recently gained access to a USB-Floppy to work on fixing one bug). For now, the best recommendation I can give, is before writing to a drive, select a new img file and perform a read. If the read fails due to drive space (and you have plenty of free space), STOP IMMEDIATELY and file a bug with your system info. Please don't write a negative review, as that doesn't help us communicate with you if we need more information.