OK then...
I used the following code to get the list of ManualTests. Basically, the code scans the current project file for the items that end with '.tcMT' which is the extension of the files with Manual Tests.
I believe that you can adopt this to iterate through all project files within your test suite and search not for Manual but for Keyword tests.
 '-------------------------------------------------------------------------------
 Function GetManualTestsCollection
   Const cProcName = "GetManualTestsCollection"
   Dim cProcNameMsgPrefix
   cProcNameMsgPrefix = cUnitNameMsgPrefix & cProcName & "(): "
   Const cExt = ".tcMT"
   Dim Doc
   Dim ManualTestCollection
   Dim Nodes
   Dim Node
   Dim strManTCName
   Dim i
   Set ManualTestCollection = CreateObject("Scripting.Dictionary")
   Set GetManualTestsCollection = ManualTestCollection
   If ("" = BuiltIn.GetCOMServerPath("Msxml2.DOMDocument.4.0")) Then InstallMSXML
   ' Create COM object
   Set Doc = Sys.OleObject("Msxml2.DOMDocument.4.0")
   Doc.async = False
   ' Load data from the current project file
   Call Doc.load(Project.FileName)
   ' Report an error, if, for instance, the markup or file structure is invalid
   If (Doc.parseError.errorCode <> 0) Then
     s = "Reason:" & vbTab & Doc.parseError.reason & vbCrLf & _
         "Line:"   & vbTab & CStr(Doc.parseError.line) & vbCrLf & _
         "Pos:"    & vbTab & CStr(Doc.parseError.linePos) & vbCrLf & _
         "Source:" & vbTab & Doc.parseError.srcText
     ' Post an error to the log and exit
     Call Log.Error(cProcNameMsgPrefix & "Error when parsing the project file.", _
         Project.FileName & vbCrLf & s)
     Set Doc = Nothing
     Exit Function
   End If
   ' Use an XPath expression to obtain the list of Manual tests nodes
 '/Nodes/Node[@name="root"]/Node[@name="child list"]/Node/Node[@name="item data"]/Prp[@name="storage"]
 '/Nodes/Node//*/Prp[@name="storage"]
 '//Prp[@name="storage"]
 '  Set Nodes = Doc.selectNodes("//Prp[@name=""storage""]")
 '  Set Nodes = Doc.selectNodes("//Node[contains(@name,"".tcmt"")]")
   ' Case insensitive search for the 'name' nodes that contain the cExt ('.tcMT') extension
   ' Based on:
   ' http://stackoverflow.com/questions/614797/xpath-find-a-node-that-has-a-given-attribute-whose-value-contains-a-string
   ' http://www.dotnetspider.com/resources/470-Doing-case-InSensitve-comparisons-using-XPa-X.aspx
   'Set Nodes = Doc.selectNodes("//Node[contains(translate(@name, ""abcdefghijklmnopqrstuvwxyz"", ""ABCDEFGHIJKLMNOPQRSTUVWXYZ""),translate(""" & cExt & """, ""abcdefghijklmnopqrstuvwxyz"",""ABCDEFGHIJKLMNOPQRSTUVWXYZ""))]")
   ' Return 'name' nodes that ends on cExt value (case insensitive compare)
   ' Case insensitive search for the 'name' nodes that end on the cExt ('.tcMT') extension
   ' Based on:
   ' http://stackoverflow.com/questions/614797/xpath-find-a-node-that-has-a-given-attribute-whose-value-contains-a-string
   ' http://www.dotnetspider.com/resources/470-Doing-case-InSensitve-comparisons-using-XPa-X.aspx
   ' http://bytes.com/topic/xml/answers/726552-xpath-query-ends
   Set Nodes = Doc.selectNodes("//Node[substring(translate(@name, ""abcdefghijklmnopqrstuvwxyz"", ""ABCDEFGHIJKLMNOPQRSTUVWXYZ""), string-length(@name) - string-length(""" & cExt & """) + 1, string-length(@name)) = translate(""" & cExt & """, ""abcdefghijklmnopqrstuvwxyz"",""ABCDEFGHIJKLMNOPQRSTUVWXYZ"")]")
   ' Process the nodes
   For Each Node In Nodes
     For i = 0 To Node.attributes.length-1
 '      If ("value" = Node.attributes(i).name) Then
       If ("name" = Node.attributes(i).name) Then
         strManTCName = Node.attributes(i).text 'e.g. ManualTests\ManualTest1\ManualTest1.tcMT
 '        If (0 = aqString.Compare(aqFileSystem.GetFileExtension(cExt), _
 '            aqFileSystem.GetFileExtension(strManTCName), False)) Then ' case insensitive compare
           ' get file name (without path and ext.)
           strManTCName = Utilities.ChangeFileExt(aqFileSystem.GetFileName(strManTCName), "")
           If ("" <> strManTCName) Then ManualTestCollection.Add strManTCName, Eval(strManTCName)
 '        End If
       End If
     Next
   Next
   Set Doc = Nothing
 End Function
 '-------------------------------------------------------------------------------