ftw crashes when alpha-blending is exported

[dertuxmalwieder]

A curious little problem: I wrote an application with ftw and it generally works just fine (thank you for your efforts!). However, creating and using an .exe just won't work if I use alpha-blending. I can perfectly reproduce that with your own example code, as icon.lisp uses alpha-blending as well:

> sbcl --load icon.lisp

(...)

* (sb-ext:save-lisp-and-die "test.exe" :toplevel #'ftw.icon:test-icon3 :executable t)

Trying to run test.exe, the result I get in the console window is: "Error 87: wrong parameter". This is weird, as calling (ftw.icon:test-icon3) right from inside of the REPL does not have any problem, and I have no problem compiling other examples like dragdrop.lisp. What could be the culprit here?

Windows 10, 64-bit.