Hi what is this missing file?

Brian's Mail list account <bglists@...>

Whatever it is it crashed nvda just now cos its not there.
The program can't start because oehook.dll is missing from your computer. Try reinstalling the program to fix this problem.

The program was the webbie pdf reader save option on the menu with a document open.
All speech stopped on the installed latest version andI had to force boot a different portable version to get to know what was actually going on.
Should I be worried about this file not being there?
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