A daily updated filename extension database!

MCO file extension

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

  • What is the .mco file?
  • What program do I need to open a .mco file?
  • How can the .mco file be opened, edited or printed?
  • How can I convert .mco files to another format?
  • Where can I find the specifications for .mco?
  • Which MIME-type is associated with the .mco extension?

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

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

Live Messenger Content Object

MCO file is a Live Messenger Content Object (Wink).
Application: Live Messenger
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
MCO aliases:
MCO related links:
MCO related extensions:
MSN Messenger Contact List

Live Messenger Custom Emoticon Image

Live Messenger Custom Emoticon Metadata

Live Messenger Content

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

The .mco file extension is often given incorrectly!

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

cmo, mxo, moc, mfo, mcp, mck, mc, jco, co, nco, mso, mo, mdo, mcl, mci

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

OCaml Compiled Bytecode
Microsoft Office Rendering Data
Media Control Interface Data
Cult3D Object
Max Macintosh External Object
Microsoft IIS Metabase Backup
Macro Keys Encrypted Macro
CelLab Own Code
Nero BackItUp Compressed Data

Can't open a .mco 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 .mco 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 .mco file extension, write to us!

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