THE NXT Software does what many Windows programs do and creates a variety of "My" folders or other profile-based data storage points that are often lost by users.
This frequently happens if a computer crashes, a profile is deleted, or if you simply logon as someone else. In addition, NXT software has it's own set of 'folders' etc. which makes the entire file management effort a nightmare and backups impossible.
Why is this a problem?
When you program in NXT the programs store various relationships between elements, particularly MyBlocks, as Windows paths like this: "C:\ Documents and Settings\John Doe\My Documents\My Pictures" However, you do not have access to these stored paths so if you do a complex program, and then try to open it from a back up on another computer, all the paths are wrong and the program fails you you have to painstakingly re-link everything.
Move the files from one computer to another, open in a different user account, and everything breaks and even attempts to re-link file often doesn't work.
Most of our programs never recovered.