.P7A File

The p7a file extension is related to the PKCS #7 signature data.

S/MIME (Secure/Multipurpose Internet Mail Extensions) provides a consistent way to send and receive secure MIME data.

Based on the popular Internet MIME standard, S/MIME provides the following cryptographic security services for electronic messaging    applications: authentication, message integrity and non-repudiation of origin (using digital signatures) and privacy and data security (using encryption).

Mime types:
application/x-pkcs7-signature

How to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .p7a file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.