diff --git a/btree.h b/btree.h
index 40247ea..582fd28 100644
--- a/btree.h
+++ b/btree.h
@@ -1,9 +1,9 @@
 #ifndef BTREE_H
 #define BTREE_H
 
-#include "btypes.h"     // integer definitions
-#include "btree_vfs.h"  // bTreeVFS class
-#include "btree_key.h"  // bTree key functions
+#include "btree_types.h" // integer definitions
+#include "btree_vfs.h"   // bTreeVFS class
+#include "btree_key.h"   // bTree key functions
 
 enum treeTypes { BT_CUSTOM, BT_PCHAR, BT_STRING, BT_SINGLE, BT_DOUBLE, BT_INT32, BT_INT64 };
 
diff --git a/btree_key.cpp b/btree_key.cpp
index 08763e3..93ce914 100644
--- a/btree_key.cpp
+++ b/btree_key.cpp
@@ -8,7 +8,7 @@
 } // compareKeyNull
 
 int 
-compareKeyString(void * , void * ) { 
+compareKeyString(void *, void *) { 
   return 0;
 } // compareKeyString
 
diff --git a/btree_standardVFS.cpp b/btree_standardVFS.cpp
new file mode 100644
index 0000000..30bf01d
--- /dev/null
+++ b/btree_standardVFS.cpp
@@ -0,0 +1,3 @@
+#include "btree_vfs.h"
+#include "btree_standardVFS.h"
+
diff --git a/btree_standardVFS.h b/btree_standardVFS.h
new file mode 100644
index 0000000..447d2cb
--- /dev/null
+++ b/btree_standardVFS.h
@@ -0,0 +1,20 @@
+#ifndef BTREE_STANDARDVFS_H
+#define BTREE_STANDARDVFS_H
+
+#include <stdio.h>
+#include "btree_vfs.h"
+
+class StandardVFS : bTreeVFS {
+ public:
+                StandardVFS(void) { }
+  virtual bool  fClose(void) { return false; }
+  virtual bool  fCreate(char *) { return false; }
+  virtual bool  fExist(char *) { return false; }
+  virtual bool  fOpen(char *) { return false; }
+  virtual bool  fRead(char *) { return false; }
+  virtual bool  fSeek(uInt32) { return false; }
+  virtual bool  fWrite(void *, uInt32) { return false; }
+  virtual       ~StandardVFS(void) { }
+};
+
+#endif
diff --git a/btree_types.h b/btree_types.h
new file mode 100644
index 0000000..7e0f379
--- /dev/null
+++ b/btree_types.h
@@ -0,0 +1,13 @@
+#ifndef BTREE_TYPES_H 
+#define BTREE_TYPES_H
+
+typedef signed char            int8;
+typedef signed short int       int16;
+typedef signed long int        int32;
+typedef signed long long int   int64;
+typedef unsigned char          uInt8;
+typedef unsigned short int     uInt16;
+typedef unsigned int           uInt32;
+typedef unsigned long long int uInt64;
+
+#endif
diff --git a/btree_vfs.h b/btree_vfs.h
index b51169a..fbb6d63 100644
--- a/btree_vfs.h
+++ b/btree_vfs.h
@@ -1,16 +1,18 @@
 #ifndef BTREE_VFS_H 
 #define BTREE_VFS_H
 
+#include "btree_types.h"
+
 class bTreeVFS {
  public:
                 bTreeVFS(void);
   virtual bool  fClose(void) = 0;
-  virtual bool  fCreate(char * filename) = 0;
-  virtual bool  fExist(char * filename) = 0;
-  virtual bool  fOpen(char * filename) = 0;
-  virtual bool  fRead(char * filename) = 0;
-  virtual bool  fSeek(uInt32 offset) = 0;
-  virtual bool  fWrite(void * buf, uInt32 size) = 0;
+  virtual bool  fCreate(const char *) = 0;
+  virtual bool  fExist(const char *) = 0;
+  virtual bool  fOpen(const char *) = 0;
+  virtual bool  fRead(const char *) = 0;
+  virtual bool  fSeek(uInt32) = 0;
+  virtual bool  fWrite(void *, uInt32) = 0;
   virtual      ~bTreeVFS(void) = 0;  
 };  // bTreeVFS
 
diff --git a/btypes.h b/btypes.h
deleted file mode 100644
index fe843e5..0000000
--- a/btypes.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef BTYPES_H
-#define BTYPES_H
-
-typedef signed char            int8;
-typedef signed short int       int16;
-typedef signed long int        int32;
-typedef signed long long int   int64;
-typedef unsigned char          uInt8;
-typedef unsigned short int     uInt16;
-typedef unsigned int           uInt32;
-typedef unsigned long long int uInt64;
-
-#endif