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I have several image files that were originally .png, but due to my own needs I changed their name to some custom extension .xyz.

Thankfully, I can still preview the images using the spacebar, so that's great. However, their thumbnail is blank:

enter image description here

Is it possible to tell Finder to render the image for files with extension .xyz? Note that the file contents are identical to that of a .png file - it's just the extension which is different for my own needs.

I am running macOS High Sierra 10.13.2.

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    Why change the extension? You could always append .png to your custom extension so the file would be 001.xyz.png – njboot Apr 3 '18 at 3:47
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    Additionally, under "Get Info" you can "Hide Extension." So if your file is 001.xyz.png it should appear 001.xyz while still being recognized as a .png file. Not submitting this as an answer because I haven't tested it. – njboot Apr 3 '18 at 3:55
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    @njboot for game development. For example Unity will always reformat/compress any image it finds unless its extension is .bytes. So I can't append .bytes to .png (because then its basename includes .png and that just breaks filename paths in the project) or hide the extension. Yet, with the spacebar I can preview .bytes image files, so I assume there has to be a way to see their thumbnails as well - that would help me speedup development to find the right image visually (all images have strange names). – JVon Apr 3 '18 at 5:33

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