works well:
;Winbatch 2013 - CLR Generate Password
;
;
;Stan Littlefield June 17, 2013
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pwklength=9
pwnoalpha=4
ObjectClrOption("use","System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")
oSecure = ObjectClrNew('System.Web.Security.Membership')
cPw = oSecure.GeneratePassword(pwklength,pwnoalpha)
oSecure=0
Message("",cPW)
Exit