>>>Thanks for the info, I will look into that. I thought there was some kind of Exe commandline as well, in which case it would be possible to all a 64bit process from within VFP?
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>>The thing I use for almost 20 years now is pkzip25.exe, and for the last 15 years, more or less, api_apprun (from downloads here, courtesy of late Ed Rauh) to shell out invisibly. It didn't even notice that it's 64 bits outside, and cloudy.
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>Under DOS I commandlined pkzip quite long (after pkarc...) but I wonder if it can handle newer stuff (size of files larger then back then)?
>I either call a wrapper for zLib in vfp which is part of vfx or I commanline rar files. As Rick plugged 7zip, I must look into it again - have used it only for arriving 7z files

I was experimenting with zlib for a few days and found out that it has its limitations - hit some size limit or whatever. With pkzip25 (last freebie version from Phil Katz, 1998) I still have no problems, and I've seen it eat really big files. Well not gigabyte sized, that kind of thing isn't covered by the app, but around 200M passes OK (because users think "compress a document" means "including video" - well now it does).