creting new file extensions

Can we create a file with an entirely new file extension......like file.n...or any such customised extensions.........
You can save files in whatever format you like
http://www.cplusplus.com/forum/beginner/12702/
Extensions don't have any special meaning. They're just what's after the last dot in the file name.
However, like the file name is descriptive of the contents of the file, the extension should (but doesn't have to) be descriptive of the format or purpose of the file. For example, .bin and .dat are common extensions for data in binary; .cfg for configuration files; .ini for INI files; etc.
But nothing keeps you from naming a file "file.thisFileIsUsedForSuchAndSuchWhenSomethingOrOther".
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