Ever wondered how to open .eml file attachments in Outlook Express? Either the file will simply not open or you will receive an error message stating an invalid program association with this file type.

If the file simply will not open, right click and save the attachment to your desktop. You should now be able to view it with Outlook Express.

If you receive an error message you will either have to re-register the Outlook Express file type or re-register the .eml file type in My Computer.

Either way, here is how it is done.

To run the Msimn executable file with the /reg option:

1. Quit Outlook Express.
2. Click Start, and then click Run.
3. In the Open box, type msimn /reg, and then click OK.

To re-register the .eml file type in My Computer:

1. On the desktop, double-click My Computer.
2. On the Tools menu, click Folder Options.
3. Click the File Types tab.
4. Under Registered file types, click EML Outlook Express Mail Message, and then click Advanced.
5. Click Open, and then click Edit.
6. Type the following single line in the Application used to perform action box:
“C:\Program Files\Outlook Express\MSIMN.EXE” /eml:%1
7. Click OK, click OK again, and then click Close.

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