Backup file version

Hello,

I'm wasting lots of time downloading versions of SDP @ the moment.

The situation:

I need to restore data from a backup, no problem.
The problem is that I don't know the version of the backup.data file.

How can I check the version of SDP when I only have the file as a reference.

If needed I can post the file as attach.

Opening it in notepad doesn't help.

tnx