Hi Crash Walker,
If you see a message saying a photo file type is not supported even though it was saved as .jpg, this usually indicates a temporary issue with the Photos app or that the file did not save correctly. Windows supports JPG files, so the format itself is not the problem.
In addition to Q&A Assist's answer, here are some recommended solutions that you can try in this situation:
1, Repair the Photos app
- Go to Settings > Apps > Installed apps
- Find Microsoft Photos
- Select Advanced options
- Select Repair
- Restart the computer and try opening the photo again
2, Reset the Photos app (if Repair does not help)
- Go to Settings > Apps > Installed apps > Microsoft Photos
- Select Advanced options
- Select Reset
- Restart the computer
3, Confirm the file extension
- Open File Explorer
- Select View > Show > File name extensions
- Confirm the file ends with
.jpg - If needed, right‑click the file and rename it to end with .jpg
4, Test the file in another app
- Right‑click the photo
- Select Open with
- Choose Paint or another image viewer
- If it opens, the Photos app was the issue
- If it does not open, the file may not have saved correctly
5, Save to a local folder - When saving photos, save first to Pictures or Documents, then move the file later if needed.
Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.
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