Unable to link default email signature to email

After searching for answers i found rons code for sending html email messages using ranged data, but i have an issue with the signature itself. The code works when a file is actually referenced, but what i need it to do is pull a users signature using a wild card. Since users will name their signature to different names, i need it to pull the default signature.

SigString = "C:\Documents and Settings\" & Environ("username") & _
                "\Application Data\Microsoft\Signatures\" & "*.htm"

but using this seems to give a error 53, object not found. Its seem i am missing something or going about it in the wrong fasion. Any assistance will be appreciated.