.UNK File Extension
Unknown File
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What is a UNK file?
Unknown file that does not have a file association; may contain file contents from an original file that was unrecognized by any program; created typically as a default extension for a corrupted or unknown file that is found in email attachments or downloads from the Web.
More Information
NOTE: Do not attempt to open UNK files unless you are certain of their content since they may contain a virus.
Programs that open UNK files
Windows
Original program that created the file