So what's the advantage of using these over whdload zip files?
I launch games from an arcade front end. I just ran a batch file to generate a config file for each zip, for example
amiga_model = A1200
fast_memory = 8192
hard_drive_0 = c:/emulators/amiga/hd/zips/5thGear_v1.0_1001.zip
x_whdload_args = 5thGear.slave
and the arcade runs (fs-uae's) launcher.exe with the config file as an argument.
One problem I've got.. and writing it out has explained the problem to me.. is that the arcade front end thinks the Amiga process has finished straight away (that'll be because Launcher runs up fs-uae and then quits).