Using AppleCommander 1.6.0 I created a DOS 3.3 DOS order disk. Not remembering what the DOS filename restrictions were, I placed some files on the disk image whose names began with digits. Turns out DOS filenames must begin with a letter and because my files didn't, trying to BLOAD them at the BASIC prompt resulted in a ?SYNTAX ERROR. To reduce confusion, AppleCommander should prevent adding files with illegal filenames (or renaming existing files to illegal filenames). ProDOS may have different filename restrictions than DOS.