Certain types of files attached to a call in Helpdesk Internet Edition cannot be opened and an HTTP 404 - File or directory does not exist error is returned.
Confirm the file exists in the virtual directory and that it can be opened directly from the attachments folder in Windows Explorer. Make sure Everyone has at least read and write privileges to the attachment folder that the attachment virtual directory points to. See article - Setting up attachments for Helpdesk Internet Edition for more information.
1. Open IIS Manager
2. Right click the server and click properties.
3. Click the 'MIME Types' button and clicked New.
4. Set Extension to .* and set the MIME type to application/octet-stream
5. Perform an IISreset
Now when a .msg attachment is opened in Heldpesk Internet Edition the user is prompted if they would like to open or save the file.
Helpdesk Internet Edition All Versions
IIS 5.0, 5.1, 6.0