After many long nights...
Koala Painter $81 marker bytes in the filenames show up again
SACHS-PICS.D64.gz
D81s’ directories get displayed in their entirety
200files.d81.gz
decades old trick of putting extra stuff behind file names works well
colosus4_8_1.d64.gz
Booze Design dudes can be proud of their royal directory arte
booze_design_royal_arte_final-A.d64.gz
and it can be seen that both DOOM files are in fact present in this disk image...
doom_workstage.d64.gz