To me, it sounds like your objective is to load the Progress data into a SQL database.
Imposing a limitation that it must be done by restoring the BAK file seems like an artificial constraint. Is there something that you are not telling us that necessitates that step?
What specific OS is the source data coming from? It is apparently a UNIX variant but is it Linux, AIX, Solaris, HPUX or?
Judging from the hex dump the backup was made recently. Did you make the backup? Or did someone do it for you? How much access do you have to the source server? Are there constraints to working with the source database?
There are 2 backups. Are they both from the same server?