I have an Excel worksheet with several hundred hyperlinks to videos I've
made. So it's tiresome to get this message every time I click one to
play it:

https://www.dropbox.com/s/utgmnyafff...ssage.jpg?dl=0

I found several web articles such as this that seemed promising but
didn't work. Probably incompatible with Win 10. None of the registry
hacks like that which I've tried so far have exorcised the message.

https://support.microsoft.com/en-gb/...007-office-pro

So I'm still looking, and have posted in the Excel forum too. It's
annoying that I can't be trusted to open files I created from scratch
myself!

Can anyone here suggest a solution please?

Terry, East Grinstead, UK