I found that option by chance WIP_COPT_FTP_MODE but it’s not documented anywhere.
Can someone provide me information about it ?
In the wip_channel.h file it is listed under /* File-handling related options. */; maybe it can lead to a real binary mode (cf. my other topic http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?f=16&t=3204)