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Windows Guides subscriber, Engineer, submitted the following guide and shows us how to change file associations using the command prompt:
Dear colleagues, many of us get problems when your registry gets corrupted or settings get changed and you have mixed up extensions associated with the wrong programs. Well, don’t panic–everything is easy, we are here to raise and offer up solution to make your life easy. I will explain how to disassociate a file that has been wrongly associated with the wrong program: