Hello everyone,

I want to know if I convert a file of any format such as mpeg,avi,doc etc into
its binary or hex file.

Can it possible to convert this binary or hex file into the original file?

if it is ,please tell me in which language?

thanks you all.I'm sorry but your question doesn't make sense to me.
All files on your computer is in binary. This is how they're stored on a hard drive. Software can then take these chunks of binary and translates them into documents, videos, pictures, etc. But the files are always in binary.
When you view a file in a hex editor, the editor is also making a translation. From binary base-2 to hexadecimal base-16. When you make an edit, the hex editor takes your base-16 input and translates it BACK into binary in ORDER to store the change to the file. In fact everything a computer does is in binary, it's the only language it understands.

But what exactly is it you're trying to accomplish? If you GAVE US some more details we might better be able to HELP you out.