Open File Extension PUB
File extension PUB is most commonly used by
First version of Microsoft Publisher for Windows was released in 1991. Since then 8 more versions were released. PUB files can be opened in read-only mode by the trial version of Microsoft Publisher even if the trial period has ended.
Another program that uses file extension PUB is "Pretty Good Privacy" (PGP) cryptography application. It uses these files for storing public portions of asymmetrical encryption/decryption keys.
More Information — File extension PUB
For more general information about files, file extensions and registry you can read one of the following articles:
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