Run Single Instance of CMD via Registry for Multiple Files?

Question

I have written a script to convert images with DirectXTex. I use %* in the command inside the script to handle however many files I pass to it by directly dragging multiple files onto it directly. It opens and handles all files in a single instance if I do it this way. I want to integrate this command into my context menu, I have done this but I cannot use %* for the command in the registry so I am using %1. If I use this, it will handle all files selected, but a separate instance is opened for each file passed to the script. How can I structure the command in the registry to handle all files passed to it in a single instance? I have tried multiple other wildcards for the command but none have had the desired effect.

Does this answer your question? How can I create a shell context menu item that takes multiple files as arguments? — DrMoishe Pippik, May 11 '23 at 17:59
The question is essentially the same but unfortunately the solutions provided there do not tackle this in an amicable way or at all @DrMoishePippik. — Mr. Mendelli, May 13 '23 at 01:42
but I cannot use %* for the command in the registry people use "%1" %* in the file association all the time without problem: Associate a File Type with a Specific Program, Best way to get file type association in Windows 10 from command line? — phuclv, Jun 30 '23 at 18:28

Run Single Instance of CMD via Registry for Multiple Files?

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