Custom File Extensions

[Jarchan]

How can I allow custom extensions such as .nltrack?? 

[Joachim Müller]

use a database tool like phpMyAdmin and edit coppermine's "filetypes" table (if you know what you're doing). Note that you can only make coppermine use it as document type, you will not be able to manipulate images this way, as the image libraries coppermine can work with (GD and ImageMagick) would have to support the custom extension as well as the coppermine code.

Joachim