How can i access a mail from MBOX-file?

Hi every one,

I am using mozilla-mail-client in my project. I am save some mail-templates. These are saved in MBOX-format. All the mails saved are stored in a single file(MBOX-Format-file).
With this MBOX-format-file another file of time .msf is created.
How can i access a particular mail from MBOX-file using the “*.msf” file.

I will be very thankfull on advice.