Temporarily changing the "open with" app for a batch of files

I've written a number of scripts which have been saved as application bundles. One of the resource folders (named "Image Files") contains all the image files used in the script -- but the image files may have a variety of default applications for opening.
I'm working on a separate script to facilitate editing the application bundles if and as necessary, and editing the image files is part of that. I need the option of opening the image files with an application other than the file's default application -- for example, I might want to open the image files with Photoshop.
In my editing script I can easily enough get a list of the image files. But to open them with, say, Photoshop, I find that I have to use a Photoshop tell block and the full path to each file as it is called (otherwise it opens with its default application). If there are hundreds of image files, that's a lot of work!
I'm seeking a "global" command that will tell all files in folder "Image Files" to open with app "Photoshop" (just in this script, as I don't want to change the defaults).
Possible?

I probably didn't explain my requirements thoroughly
Your suggestion:
"You mean like:
tell application "Finder"
open every file of folder "Macintosh HD:path:to:Image Files" using "Macintosh HD:Applications:PhotoShop.app"
end tell"
isn't quite it.
(For one thing, that has the somewhat alarming result of opening all the image files in the folder simultaneously, and there may be hundreds.)
In plain English, what I had in mind was more like:
"Set the 'open with' application of every file in folder 'Macintosh HD:path:to:Image Files' to Adobe Photoshop.app"
such that, if I were to have those files in a list, and were to open them one at a time, they'd open with Photoshop without further instruction -- this without affecting the default applications (or 'open with' applications) of the files from which those files were duplicated (assuming that there are such 'original' files).
Since this still may be unclear, here's another explanation:
• Say I have ten .jpg files on the desktop, all set to 'open with' Preview.
• I duplicate those ten files to the Image Files folder of the application bundle.
• If I open any one of those files at the desktop, I want it to open in Preview.
• But if I open any one of those files in the Image Files folder, I want it to open in Photoshop. (The
files in the Image Files folder could each have its 'open with' application reset manually, but
with hundreds of files I'd much prefer AS to do that. As far as I can tell, doing that -- manually
or with AS -- would result in different 'open with' settings for a file on the desktop and the
corresponding file in the Image Files folder, which is basically what I'm after.
Can I get AS to do this?

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Temporarily changing the "open with" app for a batch of files

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