Opening files

Good morning all

I have problems opening files including Facebook messages

at the moment I get the following message

This file does not have a program associated with it for performing this action. Please install a program or, if one already installed, create an association in the default program control panel.

I recently had my computer cleaned, and it worked fine for awhile , suddenly I can' open these files

Any suggestion

Thanks

via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/509141/opening-files/