Is it possible to deserialized a saved file of an old pascal system?

I'm working on making a latest system from an old pascal system (created in year 2008). And am trying to retrieve all of the data from that old system. It's has been said that the data was encrypted by the creator of the old system. But when i looked into the contents of the saved file using notepad, there are still readable text which are the raw data of the system. That made me think - it might not be encrypted. it might be serialized, instead. Like a saved file of c# unity game. The old system is still alive but the source code of it is no more. And the creator already passed away. So, i can't sif The internet or AI suggests that i use R language or python but it doesn't seem to work. So now, I'm trying to recreate the data's blueprint/record using pascal but there's a lot of variables and the arrangement of those variables must be correct as the original bluprint.. Can you give me other ideas to reverse-engineer the file?