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PerfectCalendar is a minimalist Win32 taskbar calendar developed by Gsasl that occupies approximately 230 KB of disk space and operates without dependencies on .NET, WebView2, or background sync services. The application silently integrates into the system tray upon startup, providing users with immediate access to a lightweight scheduling tool designed for Windows environments. Its core functionality centers on flat-file event management, storing all calendar data in a plain text events.dat file that remains fully user-accessible and portable. The software implements MCM_SETDAYSTATE bitmask highlighting to visually distinguish dates containing events through bold formatting, while supporting wildcard-based recurring events such as ****-12-25 for annual occurrences or ****-**-01 for monthly patterns. Users can summon the calendar interface via a configurable global hotkey (default Ctrl+Shift+Space) that positions itself at the cursor location, with conflict-safe handling that displays tray notifications rather than causing crashes when hotkey interference occurs. Additional features include idle fade transparency through WS_EX_LAYERED implementation, ISO week-number display columns, multi-format date copying capabilities supporting ISO 8601, US, and long-form formats, alongside concurrent UTC and local time displays. The application maintains HiDPI and 4K monitor compatibility with mouse-wheel font zoom functionality, ensures Explorer crash resilience through TaskbarCreated message handling, and persists all user settings within the HKCU registry hive. Currently at version 1.3.0 with two total releases available, PerfectCalendar serves users seeking a no-frills calendar utility that prioritizes system resource efficiency and straightforward event management. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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