need help reading backup

I need some help identifying some file formats. I have a backup from a system that went down. I want to restore the backup data but don't have a system to do it on. I want to port the data to windows and
import it into a readable format in Excel or Access for accounting purposes. The data came from a linux system running sql-ledger and postgres.
Here are the file names from the backup:
BACKUP.@@@ GL44BGT7.DNW GL44BGT7.KNW GL44DPT7.DNW GL44DPT7.KNW GL44MST7.DNW GL44MST7.KNW GL44RPT7.DNW GL44RPT7.KNW GL44TRN7.DNW GL44TRN7.KNW GLOPTS.DNW GLOPTS.KNW
The files are partially 50% readable with a text editor but the other 50% is garbled.
I need a way to import the data to a Windows Machine.
Thanks in advance.
JC
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