Trouble Loading FDF library

Hi I'm on IIS5/W2K and I am having trouble using FDF functions. In my ini file extension_dir = C:\PHP\extensions I uncommented the extension=php_fdf.dll in the list of windows extensions. I am using a virtual web folder to test my scripts. /iaphp on my local disc it's C:\iaphp I copied the adobe fdf toolkit files : Fdftk.dll, FDfTk.h and FDFTK.LIB to C:\iaphp When I open phpinfo() FDf is enabled. I have one PDF document on my local disc in a folder other than my virtual web folder. I open with ie fill out the form and submit to a test script. I works. But when I save the file on my web browser folder, browse the site, open the same file, fill it and submit it I get "Unable to load dynamic library 'C:\PHP\extensions/php_fdf.dll' - The specified module could not be found." So, does anybody know what I'm doing wrong!? Thanks! Karen