system.uname returned {}Windows APP-SC-SIT-VM1 10.0.14393 Microsoft Windows Server 2016 Datacenter x64

Steps to reproduce:

1. Put a UserParameterDir like
   UserParameterDir=c:\Program Files\Zabbix Agent 2\scripts
2. Define a UserParameter like
   UserParameter=my.key,dir
3. Ask for my.key
   zabbix_agentt2 -c PATH_TO_CONF -t my.key

Result:{}

windows cannot execute command : fork/exec ...

The frontend reports a can not find cmd.exe in the directory especified in UserParameterDir

Expected:
The directory content

Everything runs well if we delete de UserParameterDir configuration