Sorts of P7S Files

Main P7S Affiliation

.P7S

File ID:	.p7s
File Type:	PKCS #7 Signature File Format

A file with the P7S file extension is an email message that is sent to you that includes a digital signature. If a P7S file is sent to you, it is basically an assurance that the email is exactly from the one who claims who sent it and has not modified along the way. Most email clients can view and support digital signatures but if it happens that your client doesn't, the file will appear as a smime.p7s attachment.

Company:	Unknown Developer
Kind:	Encoded Files
Registry Key:	HKEY_CLASSES_ROOT\.p7s

Software Programs That Open The PKCS #7 Signature File Format:

Microsoft Outlook Express by Microsoft Corporation

Windows

Mac

Mozilla Thunderbird by Mozilla

Windows

Mac

Linux

Apple Mail by Apple

	Mac
	iOS

PostBox by PostBox Inc.

Windows

Mac

File View Pro by Solvusoft Corporation

Windows

InfoNotary e-Doc Signer by InfoNotary

Windows

Mac

	Linux
	Fedora

DigiSigner by DigiSigner

Windows

Mac

Linux

digiSeal Reader by Secrypt

Windows

P7S Viewer by PKI Advanced Solutions

Windows

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Troubleshooting Problems Opening P7S Files

Common Problems Opening P7S Files

Microsoft Outlook Express is Not Installed

When trying to open your P7S file, you get the error "Can't Open P7S File Type". Usually, this is because you do not have Microsoft Outlook Express for %%os%% installed. This will prevent you from double-clicking to open the P7S file because the OS doesn’t know how to handle it.

Tip: If you don't have Microsoft Outlook Express installed, and you know of another program to open your P7S file, you can try opening it by selecting from the programs listed under "Show Apps".

Microsoft Outlook Express is Out-of-Date

In some cases, you might have a newer (or older) version of a PKCS #7 Signature File Format file that is unsupported by your installed application version. You will need to download a newer version of Microsoft Outlook Express if you don't have the right version. Most of the time your PKCS #7 Signature File Format file was created by a newer Microsoft Outlook Express than what you have installed.

Tip: Find clues on the correct software version by right-clicking your P7S file and clicking "Properties".

Conclusion: The majority of P7S file opening issues are due to not having the correct Microsoft Outlook Express version installed.

Associated Difficulties Loading P7S Files

Assuming you have the right Microsoft Outlook Express version installed, other problems can prevent you from opening P7S files. There can be other issues - unrelated to software - preventing you from opening P7S files. Other contributing causes:

• File references in the Windows Registry for P7S are wrong
• Deletion of the P7S file description from the Registry by mistake
• Incomplete or bad installation of a software application associated with the P7S format
• The P7S itself is corrupted
• Past or present virus infection has affected your P7S
• P7S-related hardware has device drivers that obsolete
• Your PC doesn’t have enough available resources to open the PKCS #7 Signature File Format file