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SMIME file extension

The table below provides useful information about the .smime file extension. It answers questions such as:

  • What is the .smime file?
  • What program do I need to open a .smime file?
  • How can the .smime file be opened, edited or printed?
  • How can I convert .smime files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ OpenSSL S/MIME Format Message

OpenSSL S/MIME Format Message .smime file icon
The SMIME file is an OpenSSL S/MIME Format Message. S/MIME (Secure Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of MIME data.
SMIME format description not yet available
Category: Data files
Application: OpenSSL
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
SMIME aliases:
SMIME related links:
SMIME related extensions:
OpenSSL Message Digest Data

OpenSSL Private Key Data

OpenSSL Public Key Data

Other types of files may also use the .smime file extension.

🚫 The .smime file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:


Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

MIME Encoded Data

🔴 Can't open a .smime file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .smime file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .smime file extension, write to us!

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