The message is
"Word experienced an error trying to open the file. Try these suggestions.
Check the file permissions for the document or drive.
Make sure there is sufficient free memory and disk space.
Open the file with the text recovery converter."
There is then a further explanation
"This error message can appear for several reasons.
The document may be corrupt or damage. Use either the Recover Text converter or the Open and Repair feature.
Both are available from the open dialogue."
They are certainly not available with the open dialogue in Word 2010 in my version at least.
Thanks very much - it works but this is not an ideal workaround.
It was possible prior to Windows 10 to have a one click solution to open files.
Do you have any other suggestions?