rzxdump: 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/rzxdump - from package: fuse-emulator-utils

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

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