Index: /trunk/src/VBox/Runtime/r3/fileio.cpp
===================================================================
--- /trunk/src/VBox/Runtime/r3/fileio.cpp	(revision 58825)
+++ /trunk/src/VBox/Runtime/r3/fileio.cpp	(revision 58826)
@@ -145,5 +145,6 @@
      */
 #ifdef RT_OS_WINDOWS
-    AssertMsgReturn((fOpen & RTFILE_O_ACCESS_MASK) || (fOpen & RTFILE_O_ACCESS_MASK) == RTFILE_O_ATTR_ONLY, ("Missing RTFILE_O_READ/WRITE/ATTR_ONLY: fOpen=%#llx\n", fOpen), VERR_INVALID_PARAMETER);
+    AssertMsgReturn((fOpen & RTFILE_O_ACCESS_MASK) || (fOpen & RTFILE_O_ACCESS_ATTR_MASK),
+                    ("Missing RTFILE_O_READ/WRITE/ACCESS_ATTR: fOpen=%#llx\n", fOpen), VERR_INVALID_PARAMETER);
 #else
     AssertMsgReturn(fOpen & RTFILE_O_ACCESS_MASK, ("Missing RTFILE_O_READ/WRITE: fOpen=%#llx\n", fOpen), VERR_INVALID_PARAMETER);