nothing will open the file

[NorrinRadd]

I spent 5 hours on a graphic for my children's book. Saved it, interestingly enough, in Paint.NET as a multi-layer .jpeg, which I thought was fantastic as it had never worked before. Ahhh, and it isn't working now.
Now I can't open the file. I've tried Paint.NET, MS Paint, GIMP, MS Picture Manager, Windows Picture Viewer, and Windows Media Center. Maybe other programs.

The file is too big to load here in this forum.

Any advice?

[midora]

There is no multi-layer jpeg format. So maybe you changed the extension to jpeg but saved in pdn format. Try to change the extension of the file to .pdn manually.

[NorrinRadd]

I've tried that, too. Maybe there's a way that I don't know, to do that.

I Open, right-click on the file, and try to Rename, but it doesn't let me change the extension. Is there another way?

[Ego Eram Reputo]

You may need to check your file permissions/access levels.  Right-clicking on the file name and then Rename should do it for you.

[NorrinRadd]

I think that's the way, I just can't get it to work. Thank you.

It'll be okay. I've re-created the picture. Ummm, but I've saved it as a PNG

[Ego Eram Reputo]

PNG is a single layer format. This means you have to flatten a multi-layered image when saving and lose the layer structure. If you need to edit the image later, it will be more difficult because the image is flattened.

I'd always save copy of a multi-layered image as a PDN prior to saving as a PNG. Just to be sure!