.SDI File

The sdi file extension is associated with Fidonet.

A service that consists of approximately 10,000 systems world-wide which comprise a network which exchanges mail and files via Modems using a proprietary protocol. They are connected for the purposes of exchanging E-Mail to the Internet thru a series of gateway systems which interact with the Internet via UUCP with cooperating UNIX-based smart-hosts which act as their MX-receivers.

The sdi file contains software distribution network information usable within the service.

How to open:

Probably not meant to be accessed by the user.

How to convert:

Probably cannot be converted to anything else.