v0.2.0

• The language follows the system: the interface and the formulas take the first of your preferred languages that OpenSheet speaks (else English); the language entries of the File menu are gone. On macOS, OpenSheet can have a language of its own in System Settings ▸ General ▸ Language & Region ▸ Applications. OPENSHEET_LANG still forces one.
• Open from the Finder: on macOS, double-clicking a spreadsheet (once OpenSheet is its default app), Open With or a drop on the Dock icon opens it, whether OpenSheet is running or not. .xlsx, .xlsm, .xltx, .xltm, .csv and .tsv files are declared to the system, which knows them even on a Mac without Excel.
• One window per workbook, as in Excel: a file opens in the untouched Book1 when there is one, otherwise in a new window brought to the front; a file already open brings its window forward. On Windows and Linux, several files given on the command line open in a window each. Quitting asks about every window with unsaved changes.
• Installers: a disk image on macOS, signed and notarized by Apple, so OpenSheet opens with a double-click; a setup program on Windows, for your account without administrator rights, which adds OpenSheet to the Start menu and offers to open spreadsheets with it; .deb and .rpm packages on Linux with a menu entry and the file types. The portable archives stay. Every file comes with a build provenance attestation (gh attestation verify <file> --repo 0xtlt/opensheet).
• Homebrew: brew install 0xtlt/tap/opensheet installs the app, and the opensheet command for the terminal.
• An icon: a sheet of cells with a selected cell, drawn for the Liquid Glass of macOS 26 and for earlier macOS, Windows and Linux.
• On Windows, no console window opens behind OpenSheet any more.

Full Changelog: v0.1.0...v0.2.0