Calling Windows API ImageViewer.dll to display JPG files.

[#1]

I am working with a very large database of image files and want to be able to display the file for the user for visual inspection from a script.

I have been able to get the following code to load the DLL but get an error requesting a signature argument.

Does anyone know how to get a signature string from the system to pass to the DLL.

ERROR MESSAGE FORM LOG: Second argument to CallDLL must be a signature string. in access or evaluation of 'call DLL' , call DLL( "ImageView_Fullscreen", PATH_TO_IMAGE )

/*
Global Declorations
*/
Clear Log();
Clear Globals();
Names Default To Here( 1 );
/*
Variable Declarations
*/
TRUE = 1;
FALSE = 0;
RootDIR = "C:\";


// rundll32 "%ProgramFiles%\Windows Photo Viewer\PhotoViewer.dll", ImageView_Fullscreen path_to_image
// dll << CallDLL( "MessageBeep", "n", 0 );


/*
Program Initialization
*/
Set Default Directory( RootDIR );

DLL_PATH = "C:\Program Files\Windows Photo Viewer\PhotoViewer.dll";
IMAGE_PATH =
"C:\Users\dmeakin\OneDrive - Sunpower Corporation\!Projects\RDP - Fern Crack Impact on Performance\IMAGE TEACHING SET 1";
IMAGE_NAME = "TEST_IMAGE_1.JPG";
PATH_TO_IMAGE = IMAGE_PATH || "\" || IMAGE_NAME;
Show( PATH_TO_IMAGE );

DLL_HANDLE = Load DLL( DLL_PATH );
DLL_HANDLE << call DLL( "ImageView_Fullscreen", PATH_TO_IMAGE );