When you try to run an executable or batch file from a CMD prompt, nothing happens, even when you type the full path name and extension?
This is symptomatic of a missing PATHEXT value name at:
To resolve the problem, select the Environment key and Add Value name PATHEXT, as a string value (type REG_SZ). Use tip 1706 to set the data value.
You will need to shutdown and restart for the changes to become effective.