Index: printing/nt_printing.c
===================================================================
--- printing/nt_printing.c	(revision 10543)
+++ printing/nt_printing.c	(working copy)
@@ -1386,12 +1386,19 @@
 	*perr = WERR_INVALID_PARAM;
 
 	/* If architecture is Windows 95/98/ME, the version is always 0. */
-	if (strcmp(architecture, "WIN40") == 0) {
+	if (strcmp(architecture, SPL_ARCH_WIN40) == 0) {
 		DEBUG(10,("get_correct_cversion: Driver is Win9x, cversion = 0\n"));
 		*perr = WERR_OK;
 		return 0;
 	}
 
+	/* If architecture is Windows x64, the version is always 3. */
+	if (strcmp(architecture, SPL_ARCH_X64) == 0) {
+		DEBUG(10,("get_correct_cversion: Driver is x64, cversion = 3\n"));
+		*perr = WERR_OK;
+		return 3;
+	}
+
 	/*
 	 * Connect to the print$ share under the same account as the user connected
 	 * to the rpc pipe. Note we must still be root to do this.