If you only have the BigFix patch module, then you can use the software distribution wizard to package a directory. BigFix can zip up and extract the folder for you.
If you have Lifecycle module, you can use the Software distribution dashboard that makes things even easier.
However, if you wanted to, zip the directory that you need and then in the actionscript also prefetch a unzip tool (winzip, 7zip, unzip etc) to extract it.
e.g.
prefetch unzip.exe sha1:e1652b058195db3f5f754b7ab430652ae04a50b8 size:167936 http://software.bigfix.com/download/redist/unzip-5.52.exe
and then extract the compressed directory:
waithidden __Download\unzip.exe -o __Download\*your ziped file* -d "{ pathname of download folder }"