I have a 2020 MacBook Pro and am running Photoshop (22.5.0). Unsure if it's the program or transferring from Mac to windows but either way when I saving NEF images in photoshop as a JPEG something strange happens when I transfer the image to another system, say a windows comp, the JPG shows a "file" format and not an actual picture. The only fix I've found is to right click "rename" the image via "properties" to .jpg at the end.
Historically, Mac never needed extensions and did not start using them at all until compatibility with Windows started to become an issue. Operating systems recognize the file type by the extension, but Macs are more flexible on this.
The first thing to do is to show extensions on both computers:
Mac: Finder > Preferences > Advanced > Enable “Show all filename extensions.”
Win: Open File Explorer to any folder > View tab > Enable "File name extensions."
If the extensions are missing then they need to be typed in. If they are already there, then something is wrong. It's a best practice to keep file extensions visible on both Mac and Windows computers.
Are you referring to Windows File Explorer when trying to view the JPEGs? Do you use any other asset management tool like Bridge? (If so, can you see them there fine?)
Do you have file extensions hidden on the Windows system?
The current version of Photoshop is 23.2.2, so update it. It sounds like Photoshop is not saving the images with a file extension and I believe that was a bug in older versions.
It's important to know that Windows uses ONLY the file name to decide what the file is. It does not look inside. It looks for .jpg at the end, and says it's a JPEG. So, your problem is not how Photoshop saves it, but how the file gets named. Showing extensions, as recommended already, will let you see what is wrong instantly.
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