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CCS Not opening any files

A strange error. And it was not happening yesterday when I was working on a CCS project and it closed without any problems.

My project and workspace are open but when I double click main.c or .cfg (or any files), it does not open them in Edit or Debug or Simple mode.

Right click-> Open. Does not work. 

Restart CCS and my PC. Does not work.

I know it is not a problem with my computer as everything else is working fine. Any chance I disabled something accidently?