winff-qt: command not found

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/winff-qt - from package: winff-qt

You may install the required package with command apt-get install {package}

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