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Choose the downloaded exefix_cu.reg file and click open to import it.Hit Enter and in the Registry Editor window select File -> Import.Right-click on the download exefile_cu.reg file and select “ Open With”, In “ open with” select Registry Editor and when prompted to confirm, select Yes.To fix the issue, please download and run the registry editor key from here.
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This is a common problem when files are incorrectly associated either by changing default file associations or accidentally opening a file with another program where it set as default such as (notepad, paint, Wordpad, etc).
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