Applescript error: file ([filename]) doesn’t understand the “open” message." number -1708 (Photoshop, Tahoe)

Applescript error: file ([filename]) doesn’t understand the “open” message." number -1708 

This error is currently only happening within Adobe Photoshop. To be clear, most of these are scripts that have been running fine, some for years, until just recently.

This only just started happening with a recent OS update to Mac OS Tahoe 26.5. (I have also posted this in Apple forums. I was suggested I post it here.)

I can write:

tell app "Finder"

open file (choose file)

...and the files open (even Photoshop files, when initiated from the Finder)

Also:

tell app "Illustrator"

open file (choose file)

...works just fine within Illustrator

but if it's:

tell app "Photoshop"

open file (choose file)

...then I get "error: file ([file]) doesn’t understand the “open” message." number -1708 "

I've searched every forum I can find and nothing addresses that error code specifically. (Not to any point that I can diagnose a solution.)

other direct commands to Photoshop also do not function, including:

return current document ("cannot get current document")

set display dialogs to always ("cannot get display dialogs")

System Events commands appear to work:

tell application "Adobe Photoshop 2026"

activate

tell application "System Events"

keystroke "n" using {command down}

end tell

end tell

...does exactly that — opens the New File dialog.

• It's like some of the Dictionary commands aren't being understood.

• And it does not appear to be related to coercing aliases into direct paths or anything like that. Because this instruction:

tell application "Adobe Photoshop 2026"

set theFile to POSIX path of (choose file)

open file theFile

end tell

...also returns the same "doesn't understand 'open' message" -1708 error.

But the command: do shell script "open " & quoted form of theFile

...also works just fine.

• The main issue is I'm opening files with particular parameters (color space, resolution, etc.) which are only available in the Photoshop "open" command.