My creative zen has ID 041e:4157 - firmware 1.21.03e
The better application that I use was gnomad2 (much stable) but it's obsolete.
I'm testing some applications:
My first test was to solve a problem. With Rhythmbox It crashed while loading files and I could not reopen, then I tried to load files from pcmanfm, but the files loaded were not seen. I fixed it mounting from root user the Zen with mtpfs ( mtpfs -o allow_other DIR ), copied all files from Zen to pc and copy again on zen by Rhythmbox.