Usually in the metal drawer runner there are one or two screws that keep the drawer in the runner, have a look at the out side channel or the inside of the drawer.
I had a set like this many years ago. They had a small set screw inside at the back of the drawer. This would catch against a raised nib in the track to prevent the drawer being pulled all the way out. Just undo it a few turns and it should allow you to withdraw the drawer.
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