How can I upload a .c or .cpp file?

[eluser]Unknown[/eluser]
I am building a website and I want to upload a .c or .cpp file. But it shows that it is not allowed. Someone said to me that the MIME type should be 'text/plain'. what does it mean and how can I do it?

[eluser]CroNiX[/eluser]
check out
/application/config/mimes.php