Not sure if that file only works for the one e-mail program or not if I use Windows Live mail as my default instead of incredimail my EML file is automatically transferred to windows live mail.
It meens that when I open an e-mail that has an attachment in incredimail that Windows Live automatically opens with the attachment.
So not sure how it works its a mystery to me.
If I enable the EML file in incredimail it will open there.
Maybe someone else will be able to help as I only know it is needed for opening attachments how you get it I know not.
Mind you I understand Talk Talk has been having a spot of bother with some e-mails.