diff --git a/7.3.450 b/7.3.450
new file mode 100644
index 0000000..7112668
--- /dev/null
+++ b/7.3.450
@@ -0,0 +1,81 @@
+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.450
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.450 (after 7.3.448)
+Problem:    Win32: Still a problem with "!start /b".
+Solution:   Fix pointer use. (Yasuhiro Matsumoto)
+Files:	    src/os_win32.c
+
+
+*** ../vim-7.3.449/src/os_win32.c	2012-02-22 13:07:02.000000000 +0100
+--- src/os_win32.c	2012-02-22 15:29:56.000000000 +0100
+***************
+*** 4008,4028 ****
+  	    if (flags != CREATE_NEW_CONSOLE)
+  	    {
+  		char_u	*subcmd;
+! 		char_u	*cmd_shell = default_shell();
+  
+  		subcmd = vim_strsave_escaped_ext(cmdbase, "|", '^', FALSE);
+  		if (subcmd != NULL)
+  		{
+  		    /* make "cmd.exe /c arguments" */
+  		    cmdlen = STRLEN(cmd_shell) + STRLEN(subcmd) + 5;
+- 		    vim_free(subcmd);
+- 
+  		    newcmd = lalloc(cmdlen, TRUE);
+  		    if (newcmd != NULL)
+  			vim_snprintf((char *)newcmd, cmdlen, "%s /c %s",
+! 						       default_shell, subcmd);
+  		    else
+  			newcmd = cmdbase;
+  		}
+  	    }
+  
+--- 4008,4030 ----
+  	    if (flags != CREATE_NEW_CONSOLE)
+  	    {
+  		char_u	*subcmd;
+! 		char_u	*cmd_shell = mch_getenv("COMSPEC");
+! 
+! 		if (cmd_shell == NULL || *cmd_shell == NUL)
+! 		    cmd_shell = default_shell();
+  
+  		subcmd = vim_strsave_escaped_ext(cmdbase, "|", '^', FALSE);
+  		if (subcmd != NULL)
+  		{
+  		    /* make "cmd.exe /c arguments" */
+  		    cmdlen = STRLEN(cmd_shell) + STRLEN(subcmd) + 5;
+  		    newcmd = lalloc(cmdlen, TRUE);
+  		    if (newcmd != NULL)
+  			vim_snprintf((char *)newcmd, cmdlen, "%s /c %s",
+! 						       cmd_shell, subcmd);
+  		    else
+  			newcmd = cmdbase;
++ 		    vim_free(subcmd);
+  		}
+  	    }
+  
+*** ../vim-7.3.449/src/version.c	2012-02-22 14:58:24.000000000 +0100
+--- src/version.c	2012-02-22 15:33:53.000000000 +0100
+***************
+*** 716,717 ****
+--- 716,719 ----
+  {   /* Add new patch number below this line */
++ /**/
++     450,
+  /**/
+
+-- 
+You are only young once, but you can stay immature indefinitely.
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\  an exciting new programming language -- http://www.Zimbu.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///