Adobe Digital Editions 1.7.1 no longer supports fulfilling files from Adobe Content Server 3 (the ebx.etd) files, and only supports fulfilling files from Adobe Content Server 4 (the .acsm files).
Out of curiosity where did you get the .etd file from?
well, that's not correct. i have another machine with ADE and these one can open ebx.etd
But on another machine it stopped working....
By the way how can i open the ebx.etd, adobe acrobat gave also an error....
On the other machine you are using Digital Editions 1.7 (you can check this in the about box) and not Digital Editions 1.7.1.
If you do not already have a machine set up to successfully set up to accept .etd files, there is no way to do it now. Acrobat or Adobe Reader 7 can no longer be activated. The only version of Digital Editions that you can current download is 1.7.1