Surface file size not reducing while deleting surfaces

Hi,

I am currently deleting surfaces in my gINT project. Surfaces are stored in a separate file, but this file doesn't reduce in size while I'm cleaning it... Has anybody got this already?

It is a bit annoying as I have to keep handling huge files with little data in it. It seems that the surfaces are removed from the surface list but the data is still kept. Is there a way to fix that?

Thanks