This program allows you to browse a selection of the contents of your computer's hard drive with your TI-89. You can also rename, copy, move, and delete the files on your calculator and have the same changes made to the actual files on your computer.
There was both a program written for the calc in TI-BASIC and a program for the computer written in VB6. The calculator portion of it was written instead of paying attention in a history class that I took summer of 2001. I released it to ticalc.org when it was done. Because it was written in BASIC and running on a 12Mhz calculator it was too slow to be very practical, so it was more of an amusing proof of concept.