diff --git a/src/backend/port/win32/error.c b/src/backend/port/win32/error.c
deleted file mode 100644
index 77f69883697b02210339f798a7c9fc49ef5384c1..0000000000000000000000000000000000000000
--- a/src/backend/port/win32/error.c
+++ /dev/null
@@ -1,191 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * error.c
- *	  Map win32 error codes to errno values
- *
- * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
- *
- * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/port/win32/error.c,v 1.7 2006/03/05 15:58:35 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-
-static const struct
-{
-	DWORD		winerr;
-	int			doserr;
-}	doserrors[] =
-
-{
-	{
-		ERROR_INVALID_FUNCTION, EINVAL
-	},
-	{
-		ERROR_FILE_NOT_FOUND, ENOENT
-	},
-	{
-		ERROR_PATH_NOT_FOUND, ENOENT
-	},
-	{
-		ERROR_TOO_MANY_OPEN_FILES, EMFILE
-	},
-	{
-		ERROR_ACCESS_DENIED, EACCES
-	},
-	{
-		ERROR_INVALID_HANDLE, EBADF
-	},
-	{
-		ERROR_ARENA_TRASHED, ENOMEM
-	},
-	{
-		ERROR_NOT_ENOUGH_MEMORY, ENOMEM
-	},
-	{
-		ERROR_INVALID_BLOCK, ENOMEM
-	},
-	{
-		ERROR_BAD_ENVIRONMENT, E2BIG
-	},
-	{
-		ERROR_BAD_FORMAT, ENOEXEC
-	},
-	{
-		ERROR_INVALID_ACCESS, EINVAL
-	},
-	{
-		ERROR_INVALID_DATA, EINVAL
-	},
-	{
-		ERROR_INVALID_DRIVE, ENOENT
-	},
-	{
-		ERROR_CURRENT_DIRECTORY, EACCES
-	},
-	{
-		ERROR_NOT_SAME_DEVICE, EXDEV
-	},
-	{
-		ERROR_NO_MORE_FILES, ENOENT
-	},
-	{
-		ERROR_LOCK_VIOLATION, EACCES
-	},
-	{
-		ERROR_SHARING_VIOLATION, EACCES
-	},
-	{
-		ERROR_BAD_NETPATH, ENOENT
-	},
-	{
-		ERROR_NETWORK_ACCESS_DENIED, EACCES
-	},
-	{
-		ERROR_BAD_NET_NAME, ENOENT
-	},
-	{
-		ERROR_FILE_EXISTS, EEXIST
-	},
-	{
-		ERROR_CANNOT_MAKE, EACCES
-	},
-	{
-		ERROR_FAIL_I24, EACCES
-	},
-	{
-		ERROR_INVALID_PARAMETER, EINVAL
-	},
-	{
-		ERROR_NO_PROC_SLOTS, EAGAIN
-	},
-	{
-		ERROR_DRIVE_LOCKED, EACCES
-	},
-	{
-		ERROR_BROKEN_PIPE, EPIPE
-	},
-	{
-		ERROR_DISK_FULL, ENOSPC
-	},
-	{
-		ERROR_INVALID_TARGET_HANDLE, EBADF
-	},
-	{
-		ERROR_INVALID_HANDLE, EINVAL
-	},
-	{
-		ERROR_WAIT_NO_CHILDREN, ECHILD
-	},
-	{
-		ERROR_CHILD_NOT_COMPLETE, ECHILD
-	},
-	{
-		ERROR_DIRECT_ACCESS_HANDLE, EBADF
-	},
-	{
-		ERROR_NEGATIVE_SEEK, EINVAL
-	},
-	{
-		ERROR_SEEK_ON_DEVICE, EACCES
-	},
-	{
-		ERROR_DIR_NOT_EMPTY, ENOTEMPTY
-	},
-	{
-		ERROR_NOT_LOCKED, EACCES
-	},
-	{
-		ERROR_BAD_PATHNAME, ENOENT
-	},
-	{
-		ERROR_MAX_THRDS_REACHED, EAGAIN
-	},
-	{
-		ERROR_LOCK_FAILED, EACCES
-	},
-	{
-		ERROR_ALREADY_EXISTS, EEXIST
-	},
-	{
-		ERROR_FILENAME_EXCED_RANGE, ENOENT
-	},
-	{
-		ERROR_NESTING_NOT_ALLOWED, EAGAIN
-	},
-	{
-		ERROR_NOT_ENOUGH_QUOTA, ENOMEM
-	}
-};
-
-void
-_dosmaperr(unsigned long e)
-{
-	int			i;
-
-	if (e == 0)
-	{
-		errno = 0;
-		return;
-	}
-
-	for (i = 0; i < lengthof(doserrors); i++)
-	{
-		if (doserrors[i].winerr == e)
-		{
-			errno = doserrors[i].doserr;
-			ereport(DEBUG5,
-					(errmsg_internal("mapped win32 error code %lu to %d",
-									 e, errno)));
-			return;
-		}
-	}
-
-	ereport(LOG,
-			(errmsg_internal("unrecognized win32 error code: %lu",
-							 e)));
-	errno = EINVAL;
-	return;
-}