About Application manager
Select Menu > Settings and Application mgr..
With Application manager you can view details of installed applications, remove
applications, and define installation settings.
You can install the following types of applications:
● Java™ ME applications that have the .jad or .jar file extension
● Applications, compatible with the Symbian operating system, that have the .sis
or .sisx file extension
● Widgets that have the .wgz file extension
Only install applications that are compatible with your device.