p7mViewer 4.5 is a standalone application designed to view files and e-mail messages encrypted and/or signed in compliance with S/MIME standard.
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General features |
 | Displays content of smime.p7m and other files with file extension p7m |
 | Extracts attachments |
 | Verifies and displays message security |
 | Provides diagnosis on undecrypted messages |
 | Cryptography support by CryptoAPI |
Message handling |
 | Verifies opaque and transparent digital signature |
 | Decrypts encrypted messages |
 | Decodes multi-layer messages |
 | Supports Key-ID certificate identification |
 | Supports Issuer&Serial Number certificate identification |
Cryptography |
 | CryptoAPI based access to cryptographic devices and software |
 | Smartcard support through CSP (requires software supplied by the smartcard manufacturer installed) |
 | Direct PFX files handling for decrypting messages |
 | Certificate revocation checking |
Diagnostic functions |
 | Displays all available information on recipients of encrypted messages |
 | Displays detailed diagnostic information on undecrypted messages |
 | Displays detailed information on certificates installed in the system available to Windows applications |
Windows Environment Integration |
 | Displays secure Microsoft Outlook messages ® |
 | Displays Microsoft Outlook Express messages ® |
 | Utilizes CryptoAPI for cryptographic services, which gives access to certificates installed in the system, security providers, cryptographic algorithms and devices |
 | Drag&drop attachment extraction |
 | .p7m files' context menu for easy attachment extraction |
Attachments |
 | Displays and extracts files with their folder structure (if folder information is present). |
 | displays detailed information about attached files and folders. |
 | handles .p7m files nested as secure folders. |
Performance |
 | Effificiently handles arbitrarily large files |
 | Handles multiple security layers |
 | Very low memory usage during attachment extraction |
 | Displays as much content of broken (e.g. incompletely retrieved) files as possible |