--- a/uriloader/exthandler/win/nsMIMEInfoWin.cpp
+++ b/uriloader/exthandler/win/nsMIMEInfoWin.cpp
@@ -118,21 +118,21 @@ nsMIMEInfoWin::LaunchWithFile(nsIFile* a
 
         // executable is rundll32, everything else is a list of parameters, 
         // including the dll handler.
         nsCOMPtr<nsILocalFile> locFile(do_QueryInterface(aFile));
 
         if (!GetDllLaunchInfo(executable, locFile, args, PR_FALSE))
           return NS_ERROR_INVALID_ARG;
 
-        PRUint32 result = (PRUint32)
+        int result = (int)
           ::ShellExecuteW(NULL, NULL, L"rundll32.exe", args.get(),
                           NULL, SW_SHOWNORMAL);
         // Returns a value greater than 32 if successful. See msdn.
-        if (result >= 32)
+        if (result > 32)
           return NS_OK;
 
         switch (result) {
           case 0:
           case SE_ERR_OOM:
             return NS_ERROR_OUT_OF_MEMORY;
           case ERROR_FILE_NOT_FOUND:
             return NS_ERROR_FILE_NOT_FOUND;