As far as we know, there is currently no way how to convert or decrypt .crypt9 files to something else. This is usually done by users that try to access message history of latest versions of WhatsApp in attempt to read it.
Home > Search converters: crypt9 to html
Conversion of crypt9 file format to html file format beta
Search for crypt9 to html converter or software able to handle these file types.
Convert WhatsApp Messenger encrypted message database backup to HyperText Markup Language web page.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: crypt9 file extension details, html file extension details
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