simple application that allows you to resize, edit and change the screen resolution of Java based JAR games to any of the following predefined formats : 176 X 208 (Basic) , 240 X 320 (QVGA) and 352 X 416 (Double) right from your desktop. Just select the original and desired screen resolution for the game you want, select the JAR file from your computer and it will automatically make the necessary changes for you.
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Java Games Resizer