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Help Naming a file on sd card.

You can either do it by connecting your phone to your computer and finding the file you want to rename on there and just rename it normally, or -

you can use something like root explorer or probably Astro also. Open the app, then scroll to sdcard. Find the file you want in there and long press on it, then select rename.
 
In the app drawer, choose "Files". Then choose "Phone Files". As Btros said, download Astro File Manager. It also backs up your apps and shows SD card usage.
 
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