Ability to open .rpmsg files sent from outlook

We need the ability to be able to "Open, Read & Reply" to .rpmsg files in Front. Link on how to execute: Remote Processor Messaging (rpmsg) Framework — The Linux Kernel documentation

Currently this file is only viewable by email recipients who use outlook. Which’s means I cannot read emails sent in this format without having to find an option. To open in outlook. Which has a certificate logged to the PC.