>>Hi Rick,
>>
>>didn't 7z has an API?
>>
>>I stuck with dynazip (and somehow it becomes unreliable) so I had a look around. Juts the presure is not high enough ...
>
>For all the zipping I need I still use pkzip25.exe, original (and the last freebie) from Phil Katz. It's a bit dated, from 1998, but it still works perfectly. I shell out using late Ed Rauh's api_apprun, keep it hidden, and mostly generate .bat files, redirect the output into a .log file, redirect the error output into another, then check the latter log (if it was created at all). If I need it as a string to store in a blob field, I use filetostr().
>
>It's blazingly fast, nobody notices that there's any zipping going on.

Another good Open Source and stand-alone software program you can use is 7za.exe, which can compress/decompress almost all formats, but being the best one 7z, with the bigger compression.

It's a command line utility, that you can run from ShellExecute or the like.

Best Regards.-