Not sure whether other mentioned it- but while his www.sweetpotatosoftware.com website remains down, Craig Boyd's vfpcompression.fll works reliably up to at least Windows 8, as long as you ensure the required C++ runtimes are there as per instructions (which they no longer always are in newer versions of Windows.) There are copies of vfpcompression.fll floating around the internet. It's quick and easy to use.

Just one gotcha for any of these techniques that call external fll, dll or exe: they're prime hack vectors since it is trivially easy to hook the called function and pluck any passwords or encrypted items directly out of memory. I don't profess great expertise but it takes me a few minutes to hook 7z or any other external to lift passwords. If this is any concern to you at all: check out Chen's VFP Compiler ( http://www.baiyujia.com/vfpcompiler/en/default.asp ) and review the inline C and ASM options. Basically you can embed C++ or Assembly directly into your VFP prg and when compiled, it runs inline at that point in your prg. Now the hacker needs to step through a large dll to see what you're doing, reducing the pool of competent hackers by orders of magnitude and probably to a handful who also understand the innards of vfp. Chen does include samples of inlined C++ for AES with his installset, Can't remember whether he also did zip but it's not so difficult.