wcd.exe: 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 CentOS possible default full paths are:

/usr/bin/wcd.exe - from package: wcd

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