Crash when starting SBCL 1.1.0.36.mswinmt.1201-284e340

[orthecreedence]

When I open sbcl.exe, I get the following:

This is SBCL 1.1.0.36.mswinmt.1201-284e340, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
fatal error encountered in SBCL pid 2724(tid 6059296):
invalid magic number in core: 0x5342434c should have been 0x5342434c.

I'm on windows 7 x64, this is a clean install from http://www.siftsoft.com/inprogress/forknews.html (sbcl-1.1.0.36.mswinmt.1201-284e340-x86-64.msi installer).

Oddly enough, the standalone version works fine (http://archive.siftsoft.com/sbcl/sbcl-ci-exe-1.1.0.36.mswinmt.1201-284e340-x86-64.zip).