Create tar.gz on Windows box

I've tried to use GnuWin package, but got an error while packing a file with very long filename, so I have to find something else. Fortunately, I found that free 7Zip can do that without errors.

You need to download a free command line version (see URL in the header).
7za a -r -ttar -so dummy [what to archive] | 7za a -tgzip -si [archivename].tar.gz