We resolved all the issues for Allegro and all tests pass on Windows.
Allegro, CCL and SBCL all have issues either parsing or escaping command line arguments on Windows.
At least, Allegro has workarounds for its parsing failure, and its quirk in spawning commands is actually a plus: it gives access to a "raw" command line without interpretation by cmd.exe. I've still disabled the test for now, because it's a headache, but things basically work there. Unlike CCL and SBCL that are very broken when spawning commands and are unusable when things need non-trivial escaping.
We haven't seriously tested other implementations on Windows, yet.
—♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org Economic illiteracy often leads one to take for wealth creation or cost reduction what is only a forced displacement of activity, with no primary gain, and a lot of secondary costs and negative side-effects. — Faré