wpg2raw: 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 CentOS possible default full paths are:

/usr/bin/wpg2raw - from package: libwpg-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/wpg2raw - from package: libwpg-tools

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

Error in other languages:
wpg2raw: bevel nie gevind nie
wpg2raw: comandă negăsită
wpg2raw: comando não encontrado
wpg2raw: commande introuvable
wpg2raw: command not found
wpg2raw: käsku ei ole
wpg2raw: không tìm thấy lệnh
wpg2raw: komanda nerasta
wpg2raw: Kommando nicht gefunden.
wpg2raw: kommandot finns inte
wpg2raw: komut yok
wpg2raw: nie znaleziono polecenia
wpg2raw: níor aimsíodh an t-ordú
wpg2raw: no se encontró la orden
wpg2raw: no s'ha trobat l'ordre
wpg2raw: opdracht niet gevonden
wpg2raw: parancs nem található
wpg2raw: perintah tidak ditemukan
wpg2raw: príkaz nenájdený
wpg2raw: příkaz nenalezen
wpg2raw: команда не найдена
wpg2raw: командата не е открита
wpg2raw: 命令找不到
wpg2raw: コマンドが見つかりません