The DR-DOS/OpenDOS Enhancement Project

> since FD DEFRAG is at least supposedly able to defragment FAT32
> drives, and I don't know any other [open source] DOS program that
> can do this.

Fixed.

> Though I have not verified this, the current check indicates that
> it would not work in MS-DOS 7.1, either, which defeats the concept
> of FAT32 support - unless one thinks of FAT32 as a feature of
> FreeDOS only.

Probably the developer only runs FreeDOS and forgot about it.

> The whole idea of testing for Windows doesn't make much sense IMO
> since Windows does not allow low-level access to the drives, anyway.

Windows 4.x doesn't (unless you successfully lock the drive, which is only possible if no files are opened on it), but I think 3.x did allow it. However checking the (MS-)DOS version number to look for Windows is really a bad idea.