The installer showed "Failed to decompress files" and discarded 7-Zip's
error output, so a failure such as security software quarantining an
extracted file could not be told apart from a full disk or a broken
download.
- InstallerExtract returns negated Win32 errors for launch failures so
they no longer collide with 7-Zip exit codes; 7-Zip writes UTF-8 errors.
- window-frame.dll composes a report (result, archive, destination,
Windows version, full 7-Zip output), saves it under the updater cache
directory, and presents a task dialog with the first error line, a
collapsible bounded excerpt, and a Copy error details button. Silent
installs keep only the report; a missing task dialog falls back to a
message box.
- Unsigned Windows builds name their installer *-unsigned.exe so a
shared file cannot pass for a release artifact; version discovery
still counts them.
- The directory smoke asserts the saved report on a broken archive and
smoke-windows.ps1 accepts the prepared DLL.
Refs #4893
winewill
ab62f09c22