Half life 2 aspect ratio problem.Please help.?

I accidentally changed my half life 2 aspect ratio to widescreen.I have a widescreen monitor but it says to change the resolution ti 1366 by 768 which is present.How can i change it from the folder or files.Please help.Half life 2 aspect ratio problem.Please help.?del all the saved configuration!!n nw all the setting 'll b reset!!there 'll b a file named as configuration!!del it!!Half life 2 aspect ratio problem.Please help.?check acpa

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