diff -r 31ea0f8e3c99 -r 5af6c74cd793 kerneltest/f32test/server/b_open.cpp
--- a/kerneltest/f32test/server/b_open.cpp	Thu Jun 10 11:48:01 2010 +0100
+++ b/kerneltest/f32test/server/b_open.cpp	Wed Jun 23 11:59:44 2010 +0100
@@ -23,6 +23,9 @@
 #include <f32dbg.h>
 #include "t_server.h"
 #include "t_chlffs.h"
+#include "f32_test_utils.h"
+
+using namespace F32_Test_Utils;
 
 #ifdef __WINS__
 #define WIN32_LEAN_AND_MEAN
@@ -344,15 +347,15 @@
 // Call tests that may leave
 //
 	{
+    if (Is_SimulatedSystemDrive(TheFs, CurrentDrive()))
+        {
+		// These tests try to create a huge file to fill up the drive.
+		// This fails on WINS with drives with > 1/2G free because
+		// RFile::SetSize() (among other things) only takes a TInt.
+		test.Printf(_L("Skipping B_OPEN on PlatSim/Emulator drive %C:\n"), gSessionPath[0]);
+		return;
+        }
 
-#ifdef __WINS__
-// These tests try to create a huge file to fill up the drive.
-// This fails on WINS with drives with > 1/2G free because
-// RFile::SetSize() (among other things) only takes a TInt.
-//
-	if (gSessionPath.Left(1).CompareF(_L("C")) == 0)
-		return;
-#endif
 	CreateTestDirectory(_L("\\B_OPEN\\"));
 	InitTest();
 	testOpenFiles();