I wasn't expecting anyone NOT to use the autocompletion feature of the terminal. Please use the "tab" key to autocomplete the filename for you. If you're in the wrong directory it won't work, and then you'll know why.

dpkg -i harm<tab key> should autocomplete it
if there are multiple matches for the filename, then <tab key><tab key> in a short interval (like double click) will list all possible candidates

@warrentaye:
simple things first, I often forget this