some files can`t be deleted via FTP

ive started patchstick 3.5.1.fow windows and using the FTP client to upload some media into AppleTV im use Windows XP 64 and started apple bonjour and use this way, but some files was broked when uploaded (case reboot device by user)
now i have some files with the names “.pureftpd-upload################…” long names with some digits
i cant to delete this files via FTP cilent doesnt allow me to mak changes on to this files (my username as default frontrow)

how can i delete this files to empty AppleTV HDD to 6GB approx???

thanx

These would be need to be deleted while connected via SFTP.

http://wiki.atvflash.com/index.php?title=SSH#GUI_SSH_Access_2