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After resizing your images to exactly same right size as used in the game you could try optimizing it some more. I recommend PNG format in 8bit indexed mode (with optimized palette) as it is usually enough even for 32bit games and results as very small high quality images.

Some tips on my website: Link

After lossy optimizing you can squeeze a little more (5-15% usually) with PNG auto-optimizer called PNGOUT. Note that PNGOUT is very slow for images larger than 10MB.

I love Ags but i want to do a Flash Game so I'm leaving it for a while until I'm done game, i want to find a program that uses this programming language, or a similar one. so what is the programming language Ags uses

Java is quite similar to C++ (AGS is very much like this) and can do web applet games. Though making a game in any programming language is much harder than with AGS scripting language.

I also recommend 7-zip as it is free. Both programs support extracting .7z and .rar formats.

One of the pros of 7-zip is that it can compress to .7z-format which is usually much smaller than .rar.