thanks paola,
I'm aware of online dictionaries, and I have some pdf too, but I was trying to have one working with pb's engine, as scrolling through a pdf that big is quite a pain.
now, I've found here
http://yeelou.com/huzheng/stardict-dic/
two dictionaries:
one in stardict format (a folder with 3 files: one .dict.dz, one .ifo, and one .idx)
and another in .xdxf format.
I tried to convert them with the converter app from pocketbook site, but at no avail.
I put the files in the same folder, start converter.exe, launch the command line (command.exe filename foldername), and nothing happens. the app just close and destination folder is empty.
am I doing something wrong?