Where.com is excellent. Since we are talking about favourite DOS utilities, I am attaching another one that I can't live without. DR.COM is used just like the DIR command, but it is better. Often, I find DR is enough for some simple file housekeeping. Just put it in any directory that is in the path statement.
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dr.com
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-- Rene von Rentzell, Tokyo-- "Whenever people agree with me, I always feel I must be wrong." (Oscar Wilde)