opening .jpg.hqx files

A file type ending in .hqx was encoded with BinHex 4. It dates back to original Macintosh "Classic" OS. Preceding versions of BinHex predate even the original Macintosh, maybe the original Apple II. It is that old.

There are a number of utilities that claim the ability to decode BinHex 4 encoded file types, but I hesitate to recommend anything you can probably research on your own anyway.

Select the file then secondary-click (right-click, control-click etc) then choose Open With > TextEdit assuming TextEdit appears as an option. Assuming TextEdit can open the file and it is readable, the first line will indicate

(This file must be converted with BinHex 4.0)

... or something like it. The rest of the file will be gibberish ASCII text. That will confirm it's BinHex encoded, after which you can go about researching an appropriate decoder.

If that readable text does not appear in the first line of that file perhaps it really is corrupted.

Did you try the UnStuffit application to see if it still handles the .hqx content?

As you have confirmed this is a BinHex 4.0 packed file, you might try either of the following free tools to get at the image. Uncertain if they still handle the ancient .hqx feature, but worth a try:

1. UnStuffit
2. The UnArchiver

try stuffit expander free:

https://apps.apple.com/us/app/stuffit-expander-16/id919269455?mt=12

The UnArchiver site is a little hazy about specific older binhex support. Unstuffit used to support .hqx years ago, but again, the developers may have removed that support since classic macOS has been gone for over 20 years.

I would have suggested the same programs others already did. There is an app in the Mac App Store called "Archiver 4" but it's not free. Its "Supported file formats" include .hqx and equally ancient others.

But a .jpg is a compressed image file, and if that compression is corrupt nothing is going to work.