Calling startrfc.exe from within a vbs script

Hello, can someone help me please
I am trying to process xml idocs into SAP on a Windows 2008 server. I have written a vbs script to process the file and am trying to call STARTRFC.EXE from within the vbs script. However I keep getting an error that it cannot open the file. The code is shown below. I have changed the server name and gateway and user/passwd for security. I'm passing the filename as a variable (str_expfile) but it does not seem to be able to extract the actual file name from the variable. I know from past experience that you can pass it variables if its running on a unix box and in a shell. But for some reason it not decipering the variable name in the vbs script
Set objShell = CreateObject("Wscript.Shell")
str_startrfc = "D:\usr\sap\SID\SYS\exe\uc\NTAMD64\startrfc.exe -d SID -3 -h hostname -s 00 -g hostname -x sapgw00 -u user -p passwd -c 100 -l EN -t -F EDI_DATA_INCOMING -E PORT=MYPORT -E PATHNAME=str_expfile"
objShell.Run str_startrfc, ,True
The error I'm getting is shown below:
ERROR file opened at 20110510 134219 GMT Daylight Time, SAP-REL 700,0,278 RFC-VER 3 1200864 MT-SL
T:2584 Error in program 'startrfc': ======> Error at OPEN 'str_expfile' (check file)
T:2584 Error in program 'startrfc': <* RfcReceive [1] : returns 3:RFC_SYS_EXCEPTION
T:2584 Error in program 'startrfc': <* RfcCallReceive [1] : returns 3:RFC_SYS_EXCEPTION
Thanks
Regards
Steve

Hi Markus
Unfortunately I can't do that because I need it to process hundreds of files one after another and I would have to hard code the file path each time. That's why I need it automated.
Can startrfc.exe not take a variable for the pathname in a vb script? It works fine in a unix shell. We are migrating from unix to windows and I need to convert all my unix scripts into vb scripts.
I notice there is a nother rfc type program available, can I use rfcexec.exe instead of startrfc.exe and would it take variables?
Thanks
Regards
Steve

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