Just downloaded free File Invaders (Space Invaders clone) from Orange WAP site. It installed okay. What I would like to know is... how can I save the file so that I can keep a backup (of the SIS file) incase i want to reinstall it again?
I had a look in D: drive but only saw a file called "buy.jar" (or it was buy.jad) but when I clicked on it using File Explorer it wants to open up a new WAP connection.

The file is stored in C:\System\mdip\
Look there for a jar file. Then send it to your PC and you've backed up the instalation file :D