You do not need to unpack the DTF files from Images by Attus, those DTF files which are not jumping wrong place in 0000-0027h address range, should work with the loader created by DTF.EXE.
For example I created a loader by the following command to DOMINATOR.DTF:
dtf -cl DOMINATO.COM DOMINATO.DTF

It did not work, because the original loader packed into DOMINATO.DTF jumps to 0020h instead of 0028h, i created a small patch into the generated loader, after it finish loading the original loader, it change RST 20h to RST28h at 0123h, and voila, the program works

But for most of the DTF files, this generated loader should work without any additional action.