ABCL is special in that it can run on either Windows or Unix.
The problem is that ASDF 2.017 determines which of Windows or Unix at compile-time, which causes confusion when ABCL's builtin ASDF is compiled on Windows and used on Unix or vice-versa. And I can tell your binary was definitely produced on Windows.
(I found this issue while testing cl-launch. I also noticed that you fixed your ext:*command-line-argument-list* albeit in a necessarily incompatible way.)
I suppose the solution is that the test of unixness vs windowsness should happen at runtime. Crazy.
—♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org