.PWL File Extension
Windows Password List
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What is a PWL file?
Password file used by Windows for user logins, network and dial-up passwords; may contain up to 255 passwords, each which store a resource type, name, and password; stored in a proprietary encrypted format in the Windows directory.
PWL files are used to automatically authenticate users at login screens after they have checked the "Remember Password" option.
PWL files are similar to .KEYCHAIN files in Mac OS X.