How to change resolutions of Mobile Java Games.

Lets get to the point straight!

You have to open a *.jar file for example in WinRar and than open file “manifest.mf” from folder “META-INF”. Than write there this in the end:

Nokia-MIDlet-Original-Display-Size: 176,208
Nokia-MIDlet-Target-Display-Size: 352,416

First is original resolution of game and the second is the resolution of your phone.”

Detailed Info:

Open the jar(with winrar)

->open META-INF(directory)
->Open manifest.mf(drag it to your desktop and open it with notepad)-add the two lines Nokia-MIDlet-Original-Display-Size: 176,208 (the original resolution of the game)

Nokia-MIDlet-Target-Display-Size: 352,416 (the resolution of you phone)

->Drag the edited manifest.mf back to your jar(in meta-inf directory)
->Close Winrar
->Send to phone
->Enjoy!

Felizo, the initial part of the post is not very clear. 1. What particular .Jar file do you need for this? The game file or what?
2. Which platforms does this work on? Is this method specific to Nokia devices or it works for other Java phones as well?