How to get an incoming file in Apple Script

if the file is opened through my application

I’m confused by your setup here. Do you have a script and an application? Or have you exported your script as an application?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

I have a application

I have a application

OK. Presumably this is a Mac app, in that AppleScript is only available on the Mac. What language is the app written in? And what UI framework does it use (AppKit, UIKit, SwiftUI)?

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—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

This application written on AppleScript using Script Editor

Ah, OK. In that case the standard technique is to create an on open handler. For example, if you put this code in a script:

on open fileList
    repeat with f in fileList
        set p to POSIX path of f
        display dialog "Path: " & p buttons {"OK"} default button "OK"
    end repeat
end open

and save it as application, dropping items on to the application shows their paths in a series of dialogs.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Oh, Thanks!