mdtool.exe: 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/lib/monodevelop/bin/mdtool.exe - from package: monodevelop

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

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