You can't adjust the size while playing the game. You have to choose a size up front. It's best to select windowed mode and size from the "Adjust..." dialog.

But a game not required Glidos to run. It runs directly on windows using glide wrapper.

Oh sorry. I didn't notice which forum this post was in.

OpenGlide cannot alter the screen resolution. You'd need to configure the game to do so.

I can't change resolution in game ... It's sad because I would love to use Openglide, 640*480 too small ;(

Checkout the thread here Highres rendering patch