Test 1:
1. Installed from AB archive.
2. Make SAVE subdir in created DISCWLD folder.
3. Run. Everything works just fine.
Test 2:
1. Run the same DISC.BAT from the same already-created dir, directly to DOSBOX.
2. Save doesn't work.
Conclusion: you
must mount one dir up from DISCWLD, to be able to play.
(I.e. you must have named DISCWLD in your virtual C).