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.
CNF Windows
We have re-enabled the Windows Photo Viewer application for use. To open a photo with it:
- Browse to the folder containing the photo you wish to open
- Right click the photo and choose Open With
- You will see a list of apps. If Windows Photo Viewer is not one of the options (not to be confused with Photos, Paint, Paint3D), also choose Choose another app
- Select Windows Photo Viewer
- The picture will open in the classic Windows Photo Viewer app.
Personal Windows
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.