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* Windows: open files in the running PdfCraft instead of a new window each time (#282, #317) Outlook attachments, Explorer double-clicks and Open With start pdfcraft.exe with the file, so every file got its own process and window. Now the first PdfCraft listens on a Unix domain socket in %LOCALAPPDATA%\PdfCraft (or a portable copy's data folder), one per Windows session. A later launch that only names files sends their absolute paths, waits for "ok" and exits; the running app opens them as tabs through the existing OsEvent::Open path (the one macOS Apple events use) and comes to the front. Anything else keeps today's behaviour: --new-window, any other option, a launch without files, or any failure to hand over within 5 seconds opens a window of its own. Other platforms are unchanged. The socket lives in the user's profile, so other accounts can't create, replace or reach it. uds_windows (already in the lockfile through zbus) provides it: std has no Unix sockets on Windows and the workspace forbids unsafe. A socket left by a crash is replaced on the next start. * Windows: launches started together share one window (#282, #317) Several files selected in Explorer and opened at once start one process per file at the same moment. A launch could then find the socket bound by another launch that was not listening yet: connecting failed, clearing the socket failed with "Access is denied", and the launch opened a window of its own. Launches now take turns through a lock on a file beside the socket, held only while a launch finds out whether it is the first. A socket that cannot be cleared because another launch holds it is tried again. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_016es5tszobbb1yZ7JeozJXL * Windows: a portable copy doesn't hand files to another instance Its data folder may be writable by other accounts, so a socket there could leak or inject file paths. Builds on art804's single-instance work in #602. Co-authored-by: art804 <[email protected]> Co-Authored-By: Claude Opus 5.5 <[email protected]> --------- Co-authored-by: art804 <[email protected]> Co-authored-by: Claude Opus 5.5 <[email protected]> Co-authored-by: Brandon Thomas <[email protected]>