.ext .nes depends on ur phone just try it
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
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Blackberry can support the exe file formats.
you might not get themes of your cell phone, but try to find out the extension file of the themes that run on your phone like .nth , .sis ,.xis. look out for compatibility with the themes available on the net, download relevant themes.
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What is the file extension What is the file extension
In nokia mobiles renaming file or folder name with an extension (z.otb) we can hide
file extension for video is 101
.html, .php, or .htm
The file extension tells about the type of file, with the extension three letters. For Eg:- *.txt -- text file *.exe-- executable file
file extension
the extension of a batch file is ".bat"