another minor glitch: I had a large Stata dta file and imported it into
gretl - this actually worked flawlessly via dragging-and-dropping (on
Windows). Then I went on to save it; in the save dialog gretl inserted
the extension "gdt" automatically, and when I changed the format to the
binary gdtb type in the drop-down box at the bottom, in the end I had a
file ending in .gdt.gdtb.
Obviously very easy to correct manually in various ways along the steps
taken, but maybe now we want to shake out even minor stuff like this.