FileInfo.com - The File Extensions Resource

.MAPIMAIL File Extension

File Type	Send To Mail Recipient
File Format	File
Common?	No
File Description	Enables the "Send To->Mail Recipient" option when right-clicking a file or folder in Windows; opens the default mail program and attaches the file to a new message
Program(s) that open mapimail files	Windows: Microsoft Windows XP

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/mapimail