WinACE might work, but you'll have to set it to maximum compression and set the dictionary size to 4K
But as csimon said, it all depends on the contents. If they are jpg files or mp3s or avi's or something that's already been compressed, you're not going to be able to squeeze them down any more (well, perhaps just a little, but definitely not 50%)
Comments
try zipping it.
But as csimon said, it all depends on the contents. If they are jpg files or mp3s or avi's or something that's already been compressed, you're not going to be able to squeeze them down any more (well, perhaps just a little, but definitely not 50%)