In which cases should I use the file download?
When you download files, you will receive ‘.jar’ file (devices that support JAVA, such as BlackBerry, Nokia, Samsung, LG, etc) and “.apk” file (for Android) which are necessary for distributing your application through Bluetooth or WIF points.
Also, with these files, you can publish your apps on some stores, web sites or download platforms, such as those of some mobile phone operators.