Load"$",8
loads the disk directory by following the "LIST" command.
Load"*",8,1
Loads the first file on disk. Start via "RUN" command.
Drag & Drop the D64 image (in windowed mode) usually works fine though. Only if you want to load a specific file from an disk image it makes sense to use the normal commands.
Another way to load a specific file is to select File -> Attach Disk Image and use the internal D64 directory browser to start a PRG file.