wpd2html: 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/wpd2html - from package: libwpd-tools

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

On Debian possible default full paths are:

/usr/bin/wpd2html - from package: libwpd-tools

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

Error in other languages:
wpd2html: bevel nie gevind nie
wpd2html: comandă negăsită
wpd2html: comando não encontrado
wpd2html: commande introuvable
wpd2html: command not found
wpd2html: käsku ei ole
wpd2html: không tìm thấy lệnh
wpd2html: komanda nerasta
wpd2html: Kommando nicht gefunden.
wpd2html: kommandot finns inte
wpd2html: komut yok
wpd2html: nie znaleziono polecenia
wpd2html: níor aimsíodh an t-ordú
wpd2html: no se encontró la orden
wpd2html: no s'ha trobat l'ordre
wpd2html: opdracht niet gevonden
wpd2html: parancs nem található
wpd2html: perintah tidak ditemukan
wpd2html: príkaz nenájdený
wpd2html: příkaz nenalezen
wpd2html: команда не найдена
wpd2html: командата не е открита
wpd2html: 命令找不到
wpd2html: コマンドが見つかりません