The source code

    /**
     * @class Ext.air.DragType
     *
     * Drag drop type constants
     *
     * @singleton
     */
    Ext.air.DragType = {
    	/**
    	 * Constant for text data
    	 */
    	TEXT : 'text/plain',
    	/**
    	 * Constant for html data
    	 */
    	HTML : 'text/html',
    	/**
    	 * Constant for url data
    	 */
    	URL : 'text/uri-list',
    	/**
    	 * Constant for bitmap data
    	 */
    	BITMAP : 'image/x-vnd.adobe.air.bitmap',
    	/**
    	 * Constant for file list data
    	 */
    	FILES : 'application/x-vnd.adobe.air.file-list'
    };

    // workaround for DD dataTransfer Clipboard not having hasFormat

    Ext.apply(Ext.EventObjectImpl.prototype, {
    	hasFormat : function(format){
    		if (this.browserEvent.dataTransfer) {
    			for (var i = 0, len = this.browserEvent.dataTransfer.types.length; i < len; i++) {
    				if(this.browserEvent.dataTransfer.types[i] == format) {
    					return true;
    				}
    			}
    		}
    		return false;
    	},

    	getData : function(type){
    		return this.browserEvent.dataTransfer.getData(type);
    	}
    });