how come a depth of 0 is wrong? I figured that if you want to go zero dirs deeper then 0 would be the correct number, 1 should check that folder and one deeper imo, although i didnt test this, i've always used 0 deep for that folder only.
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depth 0 is the same as dept 999999, the same way /dcc maxcps of 0 is same as 999999. Depth 1 does 1-level search, so it searches c:\path\name\ only, while dept 2 would also search in c:\path\name\subdir\ - so if you're wanting to only get files from the base folder, anything besides level-1 wastes time by searching for total-files in all subfolders.
If you're just searching for the 1st file, and there's at least 1 matching file in the base folder, then there is no difference whether or not you limit the depth or not.