Nokia Operating System Seven also known as OS7, was released in 2007 with Nokia ST-1, it was first smartphone OS running on phone with 160x128 LCD. This OS can run any Windows media format (images, audio, videos, docs, etc.), it supports .JAR .SIS Nokia applications, .NTH .SISX themes.
With Nst series comes OS7 FP1 and OS7 FP2, most notable feature is "Nst Macro" mode.
File extensions supported by OS
- NOKIA (this format can be used for any kind of media)
Images and graphics
- BAK (Backup files)
- SIS (Symbian apps.)
- JAR (java apps.)
- NTH (Themes)
- SISX (Themes)