How To Reduce the WMB file size?

Hi, I have playing around with 3dgs for a long time, and I decide to make a game with it. but when I start seriously make a games I have problem about file size!
here's my problem:
first time I decide to learn to make a level, and I decide to makeover the level from looking the sample GAME (made with other engine), I make the level excatly same with the GAME , and when I compiled the level, the WMB size is about 3700 Kb, otherwise the size of the level from the GAME is about 375 Kb, so the size of the level file made with 3dgs is bigger about ten times from the GAMES.

the sample GAMES has 30 level and the size is about 40 Mb, so if I makeover the GAMES with 3dgs maybe the final size of game will be about 400 Mb!,

my question is, why this is happen?
Is there a way to reduce the file size of the wmb level?

I'm sorry for my very BAD ENGLISH!!!

Try to use DDS files instead of TGAs: this will dramatically reduce your file size!

Quote:

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Try to use DDS files instead of TGAs: this will dramatically reduce your file size!

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thanks for the tips heelx,yes, I will do that for the next.
but for my case, my level doesn't have any TGAs image at all (it's only made by many blocks) even I'm not use the skycube!. and have only 2 textures 128x128 size.