wmd: 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
/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/wmd - from package: wml

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