[TetraBot]

If your saving files onto a folder, you may want to check and see if you have the ability to change files saved within the folder. You may be trying to acheive the impossible.

If that's the case, try saving the file onto the desktop and then opening it. You should be able to work with your program that way.

Also check to see if your easyC/mpLab license hasn't expired. That could also be causing a problem. Other than that, I don't know what else to say.