Windows API functions should probably be called using WindowsApiCalls (Foreign Function Interface) now.
From: Mark Guzdial
Get API calls for Squeak 1.23 under Windows. Framework supports source compatibility with Visual Smalltalk 3.1x and is expandable to support compatibility with Dolphin Smalltalk.
From: AlejandroReimondo (please consider that references to him at SUGAR are obsolete and he can be reached here)