zlib1.dll: 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/i686-w64-mingw32/sys-root/mingw/bin/zlib1.dll - from package: mingw32-zlib
/usr/x86_64-w64-mingw32/sys-root/mingw/bin/zlib1.dll - from package: mingw64-zlib

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

Error in other languages:
zlib1.dll: bevel nie gevind nie
zlib1.dll: comandă negăsită
zlib1.dll: comando não encontrado
zlib1.dll: commande introuvable
zlib1.dll: command not found
zlib1.dll: käsku ei ole
zlib1.dll: không tìm thấy lệnh
zlib1.dll: komanda nerasta
zlib1.dll: Kommando nicht gefunden.
zlib1.dll: kommandot finns inte
zlib1.dll: komut yok
zlib1.dll: nie znaleziono polecenia
zlib1.dll: níor aimsíodh an t-ordú
zlib1.dll: no se encontró la orden
zlib1.dll: no s'ha trobat l'ordre
zlib1.dll: opdracht niet gevonden
zlib1.dll: parancs nem található
zlib1.dll: perintah tidak ditemukan
zlib1.dll: príkaz nenájdený
zlib1.dll: příkaz nenalezen
zlib1.dll: команда не найдена
zlib1.dll: командата не е открита
zlib1.dll: 命令找不到
zlib1.dll: コマンドが見つかりません