bring back OsPath changes

I hope that the windows test suite failure on appveyor was fixed by
updating to a newer windows there. I have not been able to reproduce
that failure in a windows 11 VM run locally.

Assistant/Threads/TransferPoller.hs

@@ -47,7 +47,7 @@ transferPollerThread = namedThread "TransferPoller" $ do
 		| otherwise = do
 			let (f, _, _) = transferFileAndLockFile t g
 			mi <- liftIO $ catchDefaultIO Nothing $
-				readTransferInfoFile Nothing (fromRawFilePath f)
+				readTransferInfoFile Nothing f
 			maybe noop (newsize t info . bytesComplete) mi
 
 	newsize t info sz