Hello 
I made a mistake, I delete my file made in Preform, so is-it possible to recover the file that is in the printer to open it in Preform?
I’m pretty sure you can’t retrieve your original .form file from the printer. I don’t know whether you’re on a Mac of WIndows but can’t you get the deleted file back from the Recycle Bin (or equivalent)?
Oops 
I go to open a support ticket, I hope they could help me 
(I will update this topic to let know if there is a way)
So I have the answer from the support : impossible 