regfiledump: 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/regfiledump - from package: regina-normal

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

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