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Profile Explorer 1.2.1, the single release from Microsoft Corporation, is a specialized CPU profiling trace viewer designed to open and analyze Event Tracing for Windows (ETW) captures taken from x64 and ARM64 systems. Aimed at developers who need to locate performance bottlenecks inside user-mode or kernel-mode code, the utility ingests standard ETW files and immediately surfaces the slowest execution paths through a multi-pane interface. The hot-function list ranks symbols by exclusive sample count, while an interactive flame graph provides a compact visual summary of call-stack distribution; a expandable call-tree supplements these overviews with parent-child timing data. For line-level investigation, the timeline pane correlates samples with wall-clock segments, the assembly-code view maps each instruction back to its event records, and the source-file view overlays per-line hit counts on original code. Together these synchronized perspectives let engineers verify optimizations, compare builds, or regress changes without leaving the same window. Because it relies solely on the ETW ecosystem already present in Windows 10 and Windows 11, Profile Explorer installs quickly, needs no additional drivers, and can be launched on demand whenever a recorded trace requires inspection. The program belongs to the Developer Tools / Performance Profilers category and, at version 1.2.1, represents the sole edition published by Microsoft. 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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