It turns out OpenFL PreForm 2.3.3 does actually support virtual printers for the Form 1, Form 1+ and Form 2, which allows dumping a print’s .flp files to a local directory.
It is unfortunately disabled in the public build, but it is relatively simple to enable by editing PreForm.exe in a hex editor.
Notes:
- This is specifically for the OpenFL 2.3.3 release of PreForm for Windows, found on the OpenFL GitHub page
- Make a backup of PreForm.exe! exe files are extremely sensitive to edits, and if done incorrectly PreForm will crash when opened. If that happens, delete the edited PreForm.exe and replace it with your backup copy with the same name! Alternatively, reinstalling PreForm should overwrite the broken copy