I had a file that I could not open in order to read (CompositeLabProWindows). I hastily went to properties in change the file to a messenger file. The file that open and I was able to read the file how ever, an order for the file to work properly I should have been left alone and not tampered with. The men how many times I download the program is still opens up in Windows messenger. My problem is that I need to restore it back to the way it was prior, and remove that the fault mechanism that all some unknown files open up the messenger. How can I do this?