Nokia .nth files are theme packages used by the Series 40 (S40) platform. These files customized the interface of classic "feature phones" from the 2000s, including icons, wallpapers, and ringtones. What is an .NTH File? : Stands for "Nokia Theme." Structure : It is essentially a renamed .ZIP archive.

If you still have a working Nokia feature phone:

Furthermore, the "Original" themes could sometimes feel sterile. While they were polished, they lacked the edgy pop-culture appeal of a custom Spider-Man or WWE theme downloaded via WAP. They were safe—corporate, even.

An .nth file is essentially a compressed renamed with the .nth extension.

: Introduced support for 240x320 resolutions and Flash Lite (.swf) content for animated wallpapers.