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Firefox using wrong program to open downloads

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About 2 weeks ago this problem began. It seems to coincide with a Firefox update. Prior to this, when I would download a file Firefox would open it with the correct program (Word, Excel, Adobe). Now Firefox tries to open all files with Adobe and I receive an error message from Adobe that the file type is either not supported or has been damaged. I happen to know these files are either Word or Excel sent to me by my work. I have been through the help to change the program used, reset it, etc. Nothing has worked. Please help! I cannot perform my work without these files. How do I tell Firefox what program to use to open these files?

About 2 weeks ago this problem began. It seems to coincide with a Firefox update. Prior to this, when I would download a file Firefox would open it with the correct program (Word, Excel, Adobe). Now Firefox tries to open all files with Adobe and I receive an error message from Adobe that the file type is either not supported or has been damaged. I happen to know these files are either Word or Excel sent to me by my work. I have been through the help to change the program used, reset it, etc. Nothing has worked. Please help! I cannot perform my work without these files. How do I tell Firefox what program to use to open these files?