xml2wordbib: 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/xml2wordbib - from package: bibutils

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

On Debian possible default full paths are:

/usr/bin/xml2wordbib - from package: bibutils

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

Error in other languages:
xml2wordbib: bevel nie gevind nie
xml2wordbib: comandă negăsită
xml2wordbib: comando não encontrado
xml2wordbib: commande introuvable
xml2wordbib: command not found
xml2wordbib: käsku ei ole
xml2wordbib: không tìm thấy lệnh
xml2wordbib: komanda nerasta
xml2wordbib: Kommando nicht gefunden.
xml2wordbib: kommandot finns inte
xml2wordbib: komut yok
xml2wordbib: nie znaleziono polecenia
xml2wordbib: níor aimsíodh an t-ordú
xml2wordbib: no se encontró la orden
xml2wordbib: no s'ha trobat l'ordre
xml2wordbib: opdracht niet gevonden
xml2wordbib: parancs nem található
xml2wordbib: perintah tidak ditemukan
xml2wordbib: príkaz nenájdený
xml2wordbib: příkaz nenalezen
xml2wordbib: команда не найдена
xml2wordbib: командата не е открита
xml2wordbib: 命令找不到
xml2wordbib: コマンドが見つかりません