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Save a BNDL gets the Finder to recognize changes in a file's BNDL resource without requiring rebuilding the Desktop or rebooting. All you have to do is drag and drop a file on it. Save a BNDL also has a button to restart the Finder if you wanted to do that (unncessary).
Save a BNDL can come handy from time to time because a file's BNDL resource controls what icon the Finder uses for the file and what other kinds of files can be dragged & dropped onto it and the Finder keeps a copy of this information in the DeskTop database, but if a file's BNDL changes or if that database gets corrupted, which can happen after a power failure and whatnot, then the copy will be out of date and thus drag/drop will not work correctly, often times refusing that you drop any file on an app that really should accept some. Symptoms also include seeing a white paper icon on an app instead of its usual custom icon.
What's funny about that app is that... when you'll download it for the first time, you may not drag files on it... because its BNDL needs to be recognized, so you might have to reboot holding down Command (Apple key) + Alt (Option key) down until it asks if you want to fully rebuild the desktop! How ironic haha!
(15.38 KiB / 15.74 KB)
/ compressed w/ Stuffit
(11.6 KiB / 11.88 KB)
Save a BNDL v1.4 (1999) / compressed w/ Stuffit
Mac OS 7.x - Mac OS 9.2.2
Emulating this? It should run fine under: Basilisk II