Check the availability of Save for web option

Tested on CS6.
Allows to save even when 32bit mode, when the menu is not available. In other cases, correctly identified incompatible modes.
Get rid of save_for_web message in case of incompatible mode will not succeed.

You can send photoshop pressing Esc using AutoIt program.

Then the message window closes itself.

app.displayDialogs = DialogModes.NO;
var file = new File("C:\\A0\\1.jpg"); // set here path to your file
var op = new ExportOptionsSaveForWeb();
with (op)
    {
    // set here options e.g.:
    // format = SaveDocumentType.JPEG;
    }        
if (!check_s4w())
    {
    alert("Can't save!!");
    }
else    
    {
    activeDocument.exportDocument(file, ExportType.SAVEFORWEB, op);
    alert("OK");
    }
    
function check_s4w()
    {
    try {
        var d = new ActionDescriptor();
        var d1 = new ActionDescriptor();
        d1.putEnumerated(charIDToTypeID("Op  "), charIDToTypeID("SWOp"), charIDToTypeID("OpRe"));
        d.putObject(stringIDToTypeID("using"), stringIDToTypeID("SaveForWeb"), d1);
        var ret = executeAction(stringIDToTypeID("export"), d, DialogModes.NO);
        return ret.count?true:false;
        }
    catch (e) { return false; }
    }