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In the weather converter DLL documentation it specifies the following parameters for the ProcessWeather() function:

Private Declare Sub ProcessWeather Lib "EPlusWth" 
    (ByVal strInType As String,      ByVal InTypeLen As Long, 
     ByVal strOutType As String,     ByVal OutTypeLen As Long, 
     ByVal strInFileName As String,  ByVal InFileNameLen As Long, 
     ByVal strOutFileName As String, ByVal OutFileNameLen As Long, 
     ErrorFlag As Boolean, 
     Optional ByVal strOutFileURL As String, Optional ByVal OutFileURLlen As Long)

(VB code)

However, the documentation omits discussing the last parameter OutFileURL.

Since It is an optional parameter the example on the same page leaves it out.

What is this for?

In the weather converter DLL documentation it specifies the following parameters for the ProcessWeather() function:

Private Declare Sub ProcessWeather Lib "EPlusWth" 
    (ByVal strInType As String,      ByVal InTypeLen As Long, 
     ByVal strOutType As String,     ByVal OutTypeLen As Long, 
     ByVal strInFileName As String,  ByVal InFileNameLen As Long, 
     ByVal strOutFileName As String, ByVal OutFileNameLen As Long, 
     ErrorFlag As Boolean, 
     Optional ByVal strOutFileURL As String, Optional ByVal OutFileURLlen As Long)

(VB code)

However, the documentation omits discussing the last parameter OutFileURL.

Since It is an optional parameter the example on the same page leaves it out.

What is this for?