Read file fails on Windows

[Meurig Sage]

Hi 
I just installed ghc-4.08.2 on Windows NT. I tried the following program 

module Main where
import System

main = do
 argv <- getArgs
 case argv of
         (inp:out:[]) -> do
             contents <- readFile inp  
             writeFile out contents

         _ -> putStr "usage_msg "

I compiled with ghc -O -o test test.hs

I ran it with 

test re_tests re_testsout

When running the program it failed with 

Fail: failed
Action: openFile
Reason: (error code: 0) re_tests

The same program worked fine when compiled with ghc-4.08.1.

Meurig