In AppleCommander 1.9.0 on macOS 12.7.2, open a DOS 3.3 disk image. The Save button in the toolbar is disabled. Make any change to the disk image to enable the Save button. Click the Save button. I expected the disk image to be saved under its original name with no further input from me, but instead, I'm presented the OS file chooser where I can type a name for the disk image file—in other words, the Save button does the same thing as the Save As button.