Function Module GUI_DOWNLOAD: Type String Issue

I am working in 4.6C. I have used this Function Module many times in the past without issue, but not at this site. It abends and gives me the error message:
The call to the function module "GUI_DOWNLOAD" is incorrect:
The function module interface allows you to specify only fields
of a particular type under "FILENAME". The field "FNAME" specified here
has a different field type.
Here is the field declaration in the code:
PARAMETER: fname type rlgrap-filename DEFAULT 'C:/New_PO_Format.xls'.
The import parameter in GUI_DOWNLOAD for FILENAME is type STRING. When I double click on STRING in the FM I get "Unable to find a tool to process request". And, TYPE STRING does not exist in the system? I started making a Z version of GUI_DOWNLOAD, but it started giving me headaches because I had to start copying other SAP function modules.
Am I missing something? Or, is there a new and improved version of GUI_DOWNLOAD to use?

data : v_file type string.
PARAMETER: fname type rlgrap-filename DEFAULT 'C:/New_PO_Format.xls'.
start-of-selection.
v_file = fname.
use v_file in gui_download parameter.
Thanks
Seshu

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I have uploaded a JPG file to a database table and when using the below function modules in the SAP 4.7 server its not opening the file.
The Below code is written for the double click event. The same code works for the ECC 6.0 version
please help.
Moderator message - Please respect the 2,500 character maximum when posting. Post only the relevant portions of code. (Your orioginal post included code that was commented out.)
Thanks in Advance.
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Edited by: NINAN on Jan 27, 2010 7:50 AM
Edited by: NINAN on Jan 27, 2010 10:07 AM
Edited by: NINAN on Jan 27, 2010 11:12 AM
Edited by: Rob Burbank on Jan 27, 2010 9:20 AM

This is the code NINAN is talking about
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* TRUNC_TRAILING_BLANKS = SPACE
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* CODEPAGE = SPACE
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* WRITE_BOM = SPACE
* TRUNC_TRAILING_BLANKS_EOL = 'X'
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NO_BATCH = 2
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NO_AUTHORITY = 5
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* APPLICATION =
* PARAMETER =
* DEFAULT_DIRECTORY =
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Function Module GUI_DOWNLOAD: Type String Issue

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