3 steps to open file with P7S extension

Usually solving problems with P7S file is simple – just install proper software and open the file. Read the guide and open P7S file now!

P7S File Extension

  • File type Digitally Signed Email Message
  • File developer N/A
  • File category Text Files
  • File popularity rating
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What is a(n) P7S file?

.P7S files are text documents attached to emails secured with a digital signature. The data contained in these files are coded in the PKCS # 7 standard and constitute a guarantee of receiving a message from the sender indicated in it and confirm that the content of the message has not been changed after sending from the indicated address. For less complex e-mail applications, the file may appear as an attachment.


How to open P7S file?

There could be multiple reasons for which the system does not support given file. In the case of P7S extension, it is probable that none of the installed programs support given file type. Therefore, user should undertake the following steps

Step 1: Install a program that supports P7S files

If an application that supports P7S files is installed on user’s system, but is not used to open such files by default, right-click on the file icon and choose "Open with" option from the menu. Next, select the proper application and check the "Always use the selected application to open this kind of files" box. The system will store this information in its registry and use the selected program to open files with P7S extension by default.

Hint for Mac OS users


For Mac OS users the procedure is analogous – open the file menu by right-clicking on the P7S file and choose "Information" option and select "Open with program" option. From the submenu select an application and click on "Change all" button.

Step 2: Find and download proper software

Inability to open P7S files may also be related to the lack of any application that supports given file being installed on the system. Should that be the case, user needs to download and install one of the following applications. Once installed, the system will automatically associate newly installed application with P7S files. If this step fails, see step 1.

Programs that support files with P7S extension

Step 3: Check the P7S file for errors

Sometimes, although relatively rarely, steps 1 and 2 might not lead to expected results. There can be several reasons for such situation to occur:

  • P7S file has been downloaded from the internet but for some reason it is incomplete. In such case the file should be re-downloaded and opened again.
  • Structure of given P7S file could be corrupted and as such the program is not able to open the file
  • Storage medium on which the file was stored is damaged
  • It is important to ascertain that the icon representing given file is not a shortcut a related P7S file no longer present in the location to which the shortcut points
  • If the user account has restricted access privileges it is advised to contact the system administrator or an IT expert

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