Sub PropsGetByIndex( _
   ByVal _bsNodeName As String, _
   ByVal _nIndex As Integer, _
   ByRef _pbsPropName As String, _
   ByRef _pbsPropValue As String, _
   ByRef _pbNode As Integer _
) 

void PropsGetByIndex( 
   string _bsNodeName,
   int _nIndex,
   out string _pbsPropName,
   out string _pbsPropValue,
   out int _pbNode
)

procedure PropsGetByIndex( 
    _bsNodeName: String;
    _nIndex: Integer;
   Out  _pbsPropName: String;
   Out  _pbsPropValue: String;
   Out  _pbNode: Integer
); 

void PropsGetByIndex( 
   BSTR* _bsNodeName,
   int _nIndex,
   [PARAMFLAG::Out] BSTR* _pbsPropName,
   [PARAMFLAG::Out] BSTR* _pbsPropValue,
   [PARAMFLAG::Out] int _pbNode
) 

Parameters

_bsNodeName

node name (for example, empty string or "info")

_nIndex

property's index

_pbsPropName

property's name

_pbsPropValue

property's value

_pbNode

indicates whether property is internal node ("1") or not ("0")

Here is example of how to get all the properties from "info" node, i.e. get all the information about a file:

string strInfo = "";
int nCount;
m_objMFReader.PropsGetCount("info", out nCount);
for (int i = 0; i < nCount; i++)
{
    string strName;
    string strValue;
    int isNode;
    m_objMFReader.PropsGetByIndex("info", i, out strName, out strValue, out isNode);
    strInfo += strName + ": " + strValue + Environment.NewLine;
}

Reference

IMFProps Interface
IMFProps Members