Get Default Signature of outlook

Hi... in Excel Vba we usually use the below code to insert Outlook Signature...

we have to enter it manually the name of the Signature like below I written Naveen.htm where Naveen is my signature name in outlook..

we cant always edit the below code and enter signature names in every pc where ever I am using this Workbook to run the macro....

 Dim Sigstring As String
 
 Sigstring = Environ("appdata") & _
                "\Microsoft\Signatures\Naveen.htm"

Is there any method to capture default signature Name which is already in outlook of current user....


as username can get from

(Environ$("Username"))