I regularly get messages with special files for use in the field. These are special data files we use to program specific systems such as fire alarm, security, health care, life-safety... When I receive them on my Droid Razr, they show up in the message as an "Unsupported file type". I do not understand why I cannot save the attachment to the phone's internal memory or SD card for access when I connect my computer. The file extensions we use are specific to the system on which we are working. Why can I not save this attachment? I tried renaming the attachment to ".zip" but I get the same message on my phone when I receive it.