From Xojo Documentation

Read-Only Property (As String )

StringValue = aApplication.AcceptFileTypes

Supported for all project types and targets.

Specifies which file types the application will accept via drag and drop.


Applies only to the initial or “blessed” instance based on the Application class and is for Macintosh only. Use the File Type Set Editor to enter the file types and in the App object's Properties pane, click the "..." button to open a dialog box in which you can edit this list.