* Requires the download of oscdimg.exe, courtesy of Microsoft's symbol servers.
* UDF only, since this is mostly intended for Windows and even with Joliet, Microsoft's
implementation of ISO-9660 is crippled (fails to use multi-extent for >4GB files, which
results in BROKEN ISO images) and too limited.
* Note that this is different from our other save to ISO feature (Alt-O), that dumped
the first optical media found on the system to an ISO.
* Also fix a Coverity warning as well as a possible crash in PopulateWindowsVersion()
when opening an invalid image (such as the ISO-9660 ones created by oscdimg).
