Scripting an answer for Warning Dialogue Box

As an option.

Use some third party psd to tif(jpg,png,etc) converter working from the command line.

Instead of opening psd(b), run the converter with app.system() and then open the converted file.

You can try this code:

// Save the current dialog display settings
var savedDisplayDialogs = app.displayDialogs;
// Disable dialog display
app.displayDialogs = DialogModes.NO;
// Open a file dialog
open(File.openDialog("Please select the file:"));
// Restore the dialogs
app.displayDialogs = savedDisplayDialogs;

This is for a single file, it is of course possible to open multiple files, or a folder, or hard code a specific file etc.

Can you provide a link to an image that triggers this dialog?

I don't think you can change that behavior, as it's automatically derived from selections, edit states of layers and what secondary data they contain. Depending on what you actually do you can probably use other methods and create custom dialogs if needed. This particular dialog for instance would likely not appear if you built the relevant checks into your script and then do a manual merge layers / flatten instead of relying on the pre-check done by the save functions.

Mylenium