Heads up: I am working in IDL (which I have never done before) I am trying to get old code which works on a 32-bit machine to work on 64-bit and am having trouble with PKUNZIP and PKZIP which aren't compatible with a 64-bit OS (Windows 7). I have 2 executable files, PKUNZIP and PKZIP, which are used in the IDL code as Code (Text): cd, skypath, current=thisone spawn,'del skyfiles.*' spawn,'del unpack.zip' spawn, 'rename '+zipfile+' unpack.zip' spawn, 'pkunzip -o unpack.zip' ... spawn,'pkzip skyfile.zip skyfiles.rad skyfiles.trn skyfiles.dep skyfiles.uwr' spawn,'rename skyfile.zip '+'SKY'+zipfile Since PKUNZIP and PKZIP don't work, does anyone know of any alternatives that can? I've tried WinRAR and WinZip, but I couldn't get them to work. I believe that they wouldn't work due to the fact that they open a GUI which asks where to unzip rather than simply unzipping to a folder named in the IDL code. Does anyone have any experience in messing with stuff like this? Thanks in advance.