On your Amiga, mount PC0 (on the Storage or Extras disk I think, inside DOSDrivers). Then put in an 880k disk and format PC0. Then put the disk in your PC and it will be accessible.
Download lha.run from Aminet. Copy it to the disk along with your compressed ADF image. Put the disk in your Amiga. Copy lha.run to RAM: and run it. The copy the resulting lha file to C: on your Workbench disk. Then use lha to decompress the archived ADF, then use trandisk (also on Aminet) to write the ADF to another floppy disk.
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moto