New file open is same window

When i click open a file it is opening in a different file(new
window)..But when I use NERDTree or any dir/file listing and open
those files, it is getting in the same display with new tab. Or i
use :browse tabnew to open a file in the same tab. All i want is, just
double click a file and it should open in as a window of gvim that is
already opened. I use Ubuntu 10.4 LTS. Is it possible?

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