We have identified an issue in Finale v.25 that can prevent parts from being extracted. When choosing the Prompt for Each Name option in the Extract Parts dialog box, the parts will not extract after clicking OK.
This issue has been reported to our development team and a fix is currently set to be included in future updates to Finale; however, there is not yet a specific time frame for the implementation of this resolution. For now, please choose the Generate Names From option instead of the Prompt for Each Name option in order to successfully extract parts.