Cause: Repair used REINSTALLMODE=ecmus. effectcraft-cli.exe has no version
resource, so Windows Installer treats it as unversioned: a changed copy
with a later write time counts as a user edit and is kept, and "c" only
checks files that carry an MSI checksum, which these don't.
Fix: Repair uses "amus", which puts back every file whatever its version
or date.
Tests: test-msi.ps1's stand-in CLI is unversioned like the real one; the
test damages it in place and repairs with the REINSTALLMODE read from
installer-ui.wxs (no longer msiexec /fa after deleting it), then compares
contents. It fails with ecmus (the damaged file stays) and passes now.
A fresh install opens on a destination page (Program Files by default;
Change... browses, with Up and New folder), then a Ready page that shows
the folder before anything is written. An upgrade goes straight to the
Ready page with the installed copy's folder and can't move it; opening the
MSI again offers Repair or Remove. Cancel, finish, files-in-use and error
dialogs are authored too. Silent installs (/qn) show none of it.
The dialogs (installer-ui.wxs) are original, built from Windows Installer's
own controls and events, not the WixUI library, whose MS-RL licence is not
on the allowed list. package.ps1 builds both .wxs files.
tylerjenningsw