What might be a good first step in identifying the cause of this error
I'd start by obtaining the original db and making a copy on the W10 pc. Open it there and see if there are any missing references in the code project. If none found, I'd then step through the code to see if I could figure out which line was causing it - assuming any code runs at all. You might find that variables need to be declared PtrSafe if you're running old code in a 64 environment.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.