P7s is related to digital signature file. You have chance to open p7s files with Xmail software.
It is an email signature file which can be produced by some softwares. For sending encrypted email, this file is sent with the message. You can try to open p7s files with X mail or Outlook software. You have chance to download x mail application via various software downloading web pages.
What to use p7s
which page related to p7s file
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