diff --git a/ChangeLog b/ChangeLog
index 7c24e9ce4..bc21850e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-02-11  Holger Vogt
+ * ngspice.h: fprintf --> tcl_fprintf added 
+ * tclspice.c: small updates for Windows 
+ * outitf.c, vectors.c, alloc.c:
+   outheap (under Windows) provided, but deactivated
+
 2012-02-11  Robert Larice
  * src/spicelib/parser/inpptree-parser.c ,
  * src/spicelib/parser/inpptree-parser.h :
diff --git a/src/frontend/outitf.c b/src/frontend/outitf.c
index 65f16181d..5317a8ea3 100644
--- a/src/frontend/outitf.c
+++ b/src/frontend/outitf.c
@@ -68,7 +68,7 @@ static void freeRun(runDesc *run);
    to prevent massive memory fragmentation of standard process heap.
    This is especially required by TCL for Windows, but may help
    also under standard Windows GUI. */
-#if (defined(HAS_TCLWIN)) && ((defined(_MSC_VER) || defined(__MINGW32__)))
+#if 0 && (defined(HAS_TCLWIN)) && ((defined(_MSC_VER) || defined(__MINGW32__)))
 #define newrealloc hrealloc
 #else
 #define newrealloc trealloc
diff --git a/src/frontend/vectors.c b/src/frontend/vectors.c
index de1308b53..31f125614 100644
--- a/src/frontend/vectors.c
+++ b/src/frontend/vectors.c
@@ -22,6 +22,14 @@ Author: 1985 Wayne A. Christopher, U. C. Berkeley CAD Group
 #include "plotting/plotting.h"
 #include "error.h" /* controlled_exit() */
 
+#if 0 && defined(HAS_TCLWIN)
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#undef BOOLEAN
+#include <windows.h>
+extern HANDLE outheap;
+#endif
+#endif
+
 #ifdef XSPICE
 /* gtri - begin - add function prototype for EVTfindvec */
 struct dvec *EVTfindvec(char *node);
@@ -813,7 +821,17 @@ vec_free_x(struct dvec *v)
         }
     }
     if (v->v_name) tfree(v->v_name);
+#if 0 && (defined(HAS_TCLWIN)) && ((defined(_MSC_VER) || defined(__MINGW32__)))
+    if (v->v_realdata) {
+        if (HeapValidate(outheap, 0, v->v_realdata))
+            HeapFree(outheap, 0, v->v_realdata);
+        else
+            tfree(v->v_realdata);
+    }
+#else
     if (v->v_realdata) tfree(v->v_realdata);
+#endif
+
     if (v->v_compdata) tfree(v->v_compdata);
     tfree(v);
     return;
diff --git a/src/include/ngspice/ngspice.h b/src/include/ngspice/ngspice.h
index 526c3c7bb..c51166f24 100644
--- a/src/include/ngspice/ngspice.h
+++ b/src/include/ngspice/ngspice.h
@@ -247,6 +247,9 @@ extern int tcl_fprintf(FILE *f, const char *format, ...);
 #undef printf
 #define printf tcl_printf
 
+#undef fprintf
+#define fprintf tcl_fprintf
+
 #undef perror
 #define perror(string) fprintf(stderr,"%s: %s\n",string,sys_errlist[errno])
 
diff --git a/src/misc/alloc.c b/src/misc/alloc.c
index aa28bf571..c25ccc3e2 100644
--- a/src/misc/alloc.c
+++ b/src/misc/alloc.c
@@ -14,7 +14,7 @@ Copyright 1990 Regents of the University of California.  All rights reserved.
 #include <tcl.h>
 #endif
 
-#if defined(HAS_WINDOWS) || defined(HAS_TCLWIN)
+#if defined(HAS_WINDOWS) || (defined(HAS_TCLWIN) && 0)
 #if defined(_MSC_VER) || defined(__MINGW32__)
 #undef BOOLEAN
 #include <windows.h>
@@ -142,7 +142,7 @@ trealloc(void *ptr, size_t num)
    Function is used in outitf.c to prevent heap fragmentation 
    An additional heap outheap is used to store the plot output data.
 */
-#if defined(HAS_TCLWIN)
+#if 0 && defined(HAS_TCLWIN)
 #if defined(_MSC_VER) || defined(__MINGW32__)
 void *
 hrealloc(void *ptr, size_t num)
diff --git a/src/tclspice.c b/src/tclspice.c
index 781b55ac7..229cf8bf6 100755
--- a/src/tclspice.c
+++ b/src/tclspice.c
@@ -187,6 +187,9 @@ HANDLE outheap;
 
 void tcl_stdflush(FILE *f);
 int  tcl_vfprintf(FILE *f, const char *fmt, va_list args);
+#if defined(__MINGW32__) || defined(_MSC_VER)
+__declspec(dllexport)
+#endif
 int  Spice_Init(Tcl_Interp *interp);
 int  Tcl_ExecutePerLoop(void);
 void triggerEventCheck(ClientData clientData,int flags);
@@ -512,7 +515,7 @@ static int vectoblt TCL_CMDPROCARGS(clientData,interp,argc,argv) {
   var = (char *)argv[1];
   var_dvec = vec_get(var);
   if ( var_dvec == NULL ){
-    Tcl_SetResult(interp, "Bad spice vector",TCL_STATIC);
+    Tcl_SetResult(interp, "Bad spice vector ", TCL_STATIC);
     Tcl_AppendResult(interp, (char *)var, TCL_STATIC);
     return TCL_ERROR;
     }
@@ -2241,7 +2244,7 @@ int Spice_Init(Tcl_Interp *interp) {
   save_interp();
 
 
-#if defined(_MSC_VER) || defined(__MINGW32__)
+#if 0 && (defined(_MSC_VER) || defined(__MINGW32__))
   /* create private heap for current process*/
   outheap = HeapCreate(0, 10000000, 0);
   if (!outheap) {
@@ -2344,9 +2347,9 @@ bot:
     for (i = 0;(key = cp_coms[i].co_comname); i++) {
       sprintf(buf,"%s%s",TCLSPICE_prefix,key);
       if(Tcl_GetCommandInfo(interp,buf, &infoPtr)!= 0){
-	printf("Command '%s' can not be registered!\n", buf);
+         printf("Command '%s' can not be registered!\n", buf);
       }else{ 
-	Tcl_CreateCommand(interp, buf, _tcl_dispatch, NULL, NULL);
+         Tcl_CreateCommand(interp, buf, _tcl_dispatch, NULL, NULL);
       }
     }