I have a
.bup file which is supposed to be a Progress database file.
My question is, how can I open/restore it and look at the data?
You need to have Progress installed. In it you will find a command:
prorest run from command line that will help you restore a previously backed up database. At least if it has been backed up using the built in back up command (probkup).
To make things easier for yourself you could start the Progress command line environment (it should be in the bin directory in your installation path). Simply run
proenv to start that and then follow the steps below. If on Windows you will most likely find proenv in your Start menu.
prorest [new database] [archive]
so for example
prorest c:\temp\mynewdatabase file.bup
A specific description of the prorest command can be found here: Progress KnowledgeBase Article 99033