Plug in your X to your computer as a flash drive using the USB connection for the SD card. When you plug in your X to your computer with the USB, options will show up on the notification panel at the top of your home screen. Select USB mode.
Then, you can open the SD card from your computer as if it is a flash drive, open the photos folder and check what's in there. You can drag/drop anything on the SD card to your computer and visa versa. You don't need special apps to do this. It's very efficient and works well, even as a backup of your SD card --> just drag/drop the entire contents to a folder on your computer.
You can add/delete ringtones, files, photos, etc. this way.