DOS环境下DEBUG和EDIT都提示is not recognized as an internal or external command为什么呢?

DOS环境下DEBUG和EDIT都提示is not recognized as an internal or external command
为什么呢?

检查环境变量PATH,确认已包含C:\WINDOWS\system32
PATH=C:\Program Files\CA\Dcs\DMScripting\;C:\Program Files\CA\DCS\CAWIN\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\CA\Unicenter S
oftware Delivery\BIN;C:\CA_APPSW;C:\Program Files\CA\SharedComponents\CAM\bin;C:\Program Files\Rational\common