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If you created the Zip file and are certain that you did not encrypt the files, it is likely that this Zip file has become corrupted in some way.

It is also possible to encrypt files in a Zip file after the Zip file is created, but the person choosing to encrypt is the one who sets the password. The password for an encrypted Zip file is set by the person who creates the Zip file at the time it is created. This indicates that the files in your Zip file have been encrypted. zipx) a Decrypt dialog will display requesting a password. In some cases, when you attempt to unzip files from (extract) or view files in a Zip file (.zip or.

If you do not know the password, you should contact the person or company from whom you obtained the Zip file to request it.

There is no universal password or backdoor password for Zip files.