Hello,
basically any HW1 *.wav file will also work in HW2 without modification. HW2 does employ a different naming scheme (files are named 036-C.wav, 037-C#.wav, ..., with the number corresponding to the normal Midi note number and always given with three digits). However, this is not required for HW2 to function in general, but the CODM assumes this nomenclature.
In addition in HW2 you can make use of multiple loops and release markers, but these are NOT required.
Hope this helps
Reiner