open new file in buffer

Hi,
generally, when I need to open multiple text file, I run it from terminal, generally open them under same window of gvim (many buffer under same window or tabbed window, whatever).
But, sometime I do need to open files via GUI, i.e. by mouse click, which always open in a new window. Is there any way to set mouse-click to open new text file to a buffer if a vim window is already open?

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