Disable automatic file view for non pictures when doubleclicking them

Hello, Im trying to guess how could it be possible to disable the automatic file view that its opened when we double click any file inside CKFinder. The result should be that only pictures wil have the pop up preview and non pictures will be directly downloaded when we double click them.

I can understand that this functionality could require a paid support account, but I think that its very basic and most users will benefit with this example with callbacks and overloading some CKFinder functions.

Example:

• picture.png will be shown in a pop up if we double click it.
• excel.xls will be directly downloaded if we double click it.

Problems in Script callback, step 3:

1. I dont know how to return the pop up window for downloading the non picture file, after I get it with getSelectedFile(). I have searched everywhere in the documentation but didnt find a way. return true or false doesnt work. I have also looked at the following topic, but I think there should be an easier way: http://stackoverflow.com/questions/3749231/download-file-using-javascript-jquery
2. I dont know how to call the CKFinder function which automatically displays the picture, after I get it with getSelectedFile().

Code:

1. assign an ID to CKFinder (step only for a php symfony proyect, remember to change config.php):

<?php
	//session_start();
	$id = $form->getObject()->getId();
	$GLOBALS["id"] = $id;
	$_SESSION["id"] = $id;
	//session_write_close();
	$idCKFinder = $id /*+ $sf_user->getGuardUser()->getId()*/;
?>

2. Script initialization:

	<script type="text/javascript">
		var finder = new CKFinder();
		finder.basePath = '/js/ckfinder/'; // The path for the installation of CKFinder (default = "/ckfinder/").
		finder.width = '99%';
		finder.defaultLanguage = 'es';
		finder.language = 'es';
		finder.id = <?php echo $idCKFinder ?>;
		finder.rememberLastFolder = true;
		finder.removePlugins = 'basket';
		finder.selectActionFunction = showFileInfo; //callbak
		api = (finder).create();
	</script>

3. Script callback when we double click a file:

<script type="text/javascript">
	var api = "";
	var enableAgain = "";
	
	// This is a sample function which is called when a file is selected and then double clicked in CKFinder.
	function showFileInfo( fileUrl, data, allFiles )
	{
		var re = /(?:\.([^.]+))?$/; //http://stackoverflow.com/questions/680929/how-to-extract-extension-from-filename-string-in-javascript
		var ext = re.exec(fileUrl)[1];   // "txt"
		var msg = "Selected file: " + fileUrl + " , extension: " + ext + "<br /><br />";
	
		//If we have more than one file or its a non picture file
		if ( (allFiles.length > 1) || ((ext != "bmp") && (ext != "jpg") && (ext != "png") && (ext != "gif")) )
		{
			alert("disabled");
			enableAgain = api.disableFileContextMenuOption('viewFile', false); // Simply call disableFileContextMenuOption to disable the menu item.

			if (allFiles.lenght > 1)
			{
				var files = api.getSelectedFiles();
			}
			else
			{
				var file = api.getSelectedFile();	
			}
		}
		else
		{
			alert("enabling");
			if ((enableAgain != null) && (enableAgain != "")) // If you want to enable it back later, remember in a variable an unlocking function.
			{
				enableAgain();
				enableAgain = "";
			}
			var file = api.getSelectedFile();
			//what goes after this? //alert(file.filenameNode().$.innerHTML);
		}

		this.openMsgDialog( "Selected file: ", msg);
	}
</script>

Thank you, any comment or tip is welcome :)