Thanks MrChad, this worked from your link:
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.