Associated with the Secure/Multipurpose Internet Mail Extension (S/MIME) protocols, a P7S file is embedded with services for cryptographic security standards. These are related to the functions of electronic messaging apps for authenticating messages and optimizing electronic data integrity during transmission. Also known as PKCS #7 signature files, these P7S files are also embedded with cryptographic services that enable digital signatures for the non-repudiation of electronic message origins.These .p7s files are not meant to be opened. These are used internally by Microsoft Outlook, AppleMail and other email management applications. It's recommended to leave these P7S files alone, in order for these email tools to continue working properly.
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