Tom Schneider

I know, what klicking on an icon means, but I still do not know what it means on macOS. It "opens" the file - if it is compressed it will uncompress. a tar.gz file would first be ungz'd and then untar'd. - one can see it doing that graphically and it's convenient and fast. Seems that for tar.xz files it means to create some unusable files... It's a bug in Apple code.

Roland: Thanks for the quick response. I don't know, what "clicking on an icon" in macOS means, nor do I understand what all these freshly created files come from. That's odd! I've met many people who don't know what the command line is, but never ones who don't know about the modern graphical interfaces! Or maybe it's a matter of English descriptions of things? (I'm guessing from your download that you are in Germany.) Anyway, for your information (FYI) ... "clicking on an icon" means to move (using...

Cannot open xfig-full-3.2.7a.tar.xz

I can cut from a Terminal and paste that into SaveAs boxes using the middle button...

xfig 3.2.6 does not accept typing into SaveAs