q4wine-helper: 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

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/q4wine-helper - from package: q4wine

You may install the required package with command apt-get install {package}
Error in other languages:
q4wine-helper: bevel nie gevind nie
q4wine-helper: comandă negăsită
q4wine-helper: comando não encontrado
q4wine-helper: commande introuvable
q4wine-helper: command not found
q4wine-helper: käsku ei ole
q4wine-helper: không tìm thấy lệnh
q4wine-helper: komanda nerasta
q4wine-helper: Kommando nicht gefunden.
q4wine-helper: kommandot finns inte
q4wine-helper: komut yok
q4wine-helper: nie znaleziono polecenia
q4wine-helper: níor aimsíodh an t-ordú
q4wine-helper: no se encontró la orden
q4wine-helper: no s'ha trobat l'ordre
q4wine-helper: opdracht niet gevonden
q4wine-helper: parancs nem található
q4wine-helper: perintah tidak ditemukan
q4wine-helper: príkaz nenájdený
q4wine-helper: příkaz nenalezen
q4wine-helper: команда не найдена
q4wine-helper: командата не е открита
q4wine-helper: 命令找不到
q4wine-helper: コマンドが見つかりません