rox: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/rox - from package: rox-filer

You may install the required package with command apt-get install {package}
Error in other languages:
rox: bevel nie gevind nie
rox: comandă negăsită
rox: comando não encontrado
rox: commande introuvable
rox: command not found
rox: käsku ei ole
rox: không tìm thấy lệnh
rox: komanda nerasta
rox: Kommando nicht gefunden.
rox: kommandot finns inte
rox: komut yok
rox: nie znaleziono polecenia
rox: níor aimsíodh an t-ordú
rox: no se encontró la orden
rox: no s'ha trobat l'ordre
rox: opdracht niet gevonden
rox: parancs nem található
rox: perintah tidak ditemukan
rox: príkaz nenájdený
rox: příkaz nenalezen
rox: команда не найдена
rox: командата не е открита
rox: 命令找不到
rox: コマンドが見つかりません