The built in Windows10 Photos app will often fail with a "Permission Denied" error. One can work around this problem by using the classic Windows Photo Viewer app.
We have re-enabled the Windows Photo Viewer application for use. To open a photo with it:
You will need to re-enable the Windows Photo Viewer application. This TechRadar article has good instructions. Note the instructions differ slightly depending on whether your Windows install is a clean Windows10 install or an upgrade install from Windows 7/8. For the clean install instructions, scroll down further in the article.