I'm going to be lazy, so forgive me

Normally I search the forum before posting, but it's been a long week.
I bought IconPackager last week. I have version 3.20. I downloaded several very nice icon packages from Wincustomize and Deviantart. If I try to load these packages using IconPackager's "Load" function I get an error that I'm missing a file. I seem to recall the missing file to be sdcunzip.dll (or something similar to that). To get around this missing file problem, I rename the downloaded iconpackage from an .IP file to a .RAR file. I then manually unzip the .RAR file and add the unzipped files to a similarly created and named iconpackager/theme folder. It works, but it's pain to go through these contortions. I highly doubt IcnPackaegr was designed to work that way.
Should I assume sdcunzip is an unzip function from Stardock Central? I'm not interested in installing SDC, so if my assumption is correct, are there workarounds? Appreciate any advice/suggestions anyone is willing to offer.