Marcel Taeumel uploaded a new version of FFI-Win32 to project FFI:
http://source.squeak.org/FFI/FFI-Win32-mt.19.mcz

==================== Summary ====================

Name: FFI-Win32-mt.19
Author: mt
Time: 16 June 2020, 2:52:08.142619 pm
UUID: cd857cca-b28d-1546-b199-89d60f44647c
Ancestors: FFI-Win32-mt.18

Use uintptr_t. Platform changes are detected automatically and all struct fields will be re-compiled automatically.

=============== Diff against FFI-Win32-mt.18 ===============

Item was changed:
  ----- Method: Win32Handle class>>fields (in category 'accessing') -----
  fields
  	"Win32Handle defineFields"
  	"The following really means
  		typedef void* Win32Handle;
  	"
+ 	^ #(nil 'uintptr_t')!
- 	^Smalltalk wordSize = 4
- 		ifTrue: [#(nil	'ulong') "an opaque 32bit handle"]
- 		ifFalse: [#(nil	'ulonglong') "an opaque 64bit handle"]!