diff --git a/src/libCom/Makefile b/src/libCom/Makefile
index b23ccdd35..c541fcfea 100644
--- a/src/libCom/Makefile
+++ b/src/libCom/Makefile
@@ -186,6 +186,8 @@ SRCS += osdPoolStatus.c
 SRCS += osdSignal.cpp
 SRCS += osdEnv.c
 SRCS += epicsReadline.c
+SRCS += epicsTempFile.cpp
+SRCS += epicsStdio.c
 
 osdEnv_CFLAGS_WIN32= -U__STDC__
 
@@ -222,15 +224,10 @@ INC_WIN32 := getopt.h
 SRCS_WIN32 := getopt.c
 SRCS_WIN32 += dllmain.cpp
 SRCS_WIN32 += forceBadAllocException.cpp
-SRCS_WIN32 += epicsStdio.c
 
 # For vxWorks a clock
 INC_vxWorks += iocClock.h
 SRCS_vxWorks += iocClock.c
-SRCS_vxWorks += epicsStdio.c
-
-# For hpux only the Stdio stuff
-SRCS_hpux += epicsStdio.c
 
 #       Library to build:
 #       lib$(LIBRARY).a  or   ..dll/..exp/..lib
diff --git a/src/libCom/osi/os/WIN32/epicsTempFile.cpp b/src/libCom/osi/os/WIN32/epicsTempFile.cpp
new file mode 100644
index 000000000..b9685216c
--- /dev/null
+++ b/src/libCom/osi/os/WIN32/epicsTempFile.cpp
@@ -0,0 +1,64 @@
+/*************************************************************************\
+* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE Versions 3.13.7
+* and higher are distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ *  $Id$
+ *  Author: Jeff Hill 
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <io.h>
+#include <fcntl.h>
+#include <sys\stat.h>
+
+#define epicsExportSharedSymbols
+#include <epicsStdio.h>
+
+//
+// epicsTmpFile
+//
+// allow the teporary file directory to be set with the 
+// TMP environment varianble
+//
+extern "C"
+epicsShareFunc FILE * epicsShareAPI epicsTempFile ( void )
+{
+    // Allow the TMP env variable to set the location
+    // where temporary files live.
+    char * pName = _tempnam ( "c:\\tmp", "epics" );
+    if( ! pName ) {
+        return 0;
+    }
+    // We use open followed by fdopen so that the _O_EXCL
+    // flag can be used. This causes detection of a race 
+    // condition where two programs end up receiving the 
+    // same temporary file name.
+    //
+    // _O_CREAT create if non-existant
+    // _O_EXCL file must not exist
+    // _O_RDWR read and write the file
+    // _O_TEMPORARY delete file on close
+    // _O_BINARY no translation 
+    // _O_SHORT_LIVED avoid flush to disk
+    //
+    const int openFlag = _O_CREAT | _O_EXCL | _O_RDWR | 
+        _O_SHORT_LIVED | _O_BINARY | _O_TEMPORARY;
+    int fd = open ( pName, openFlag, _S_IWRITE );
+    if ( fd < 0 ) {
+        printf ( 
+            "Temporary file \"%s\" open failed because "
+            "\"%s\"\n", pName, strerror ( errno ) );
+        return 0;
+    }
+    free ( pName );
+    return fdopen ( fd, "w+bTD" );
+}
+
diff --git a/src/libCom/osi/os/posix/epicsTempFile.cpp b/src/libCom/osi/os/posix/epicsTempFile.cpp
new file mode 100644
index 000000000..76b512c17
--- /dev/null
+++ b/src/libCom/osi/os/posix/epicsTempFile.cpp
@@ -0,0 +1,18 @@
+/*************************************************************************\
+* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE Versions 3.13.7
+* and higher are distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+#include <epicsStdio.h>
+
+extern "C"
+epicsShareFunc FILE * epicsShareAPI epicsTempFile ( void )
+{
+    return tmpfile ();
+}
+