You must have BOTH the dat and the db file, together in the same directory.  It would be easiest to put them in the same directory as your other Sesame databases, but not necessary as long as they are together.

Are you opening them with the Database Manager and not with the Designer?  You can make designer files from the Manager if that is what you need.

If they still don't open, what is happening? 
Are you getting an error message? 
What is the message, exactly?

I had unlocked them but that didn't help. I have used zipped files from Inside Sesame without problems.

Bob,
The db and dat are in the data directory. The message is the same as when files are locked.

I'll have them send the files unzipped and see what happens. Could be some other problem.

I just found out only the dat file was sent - supposedly - but I received db, dat, dsr, ddt.
Evidentlly they had used a jump drive that had old files.
Therefore they are unmatched. I'm sure when I get a matched pair everything will be fine.
Right now their power is out so it will be a while.

Thanks,
Harley