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docs/ai/DataPRO/Modules/InstallerCustomActions/WarnWindows11.md

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+---
+source_files:
+  - DataPRO/Modules/InstallerCustomActions/WarnWindows11/WarnWindows11.cs
+generated_at: "2026-04-17T16:15:12.796756+00:00"
+model: "zai-org/GLM-5-FP8"
+schema_version: 1
+sha256: "2c9c3764491675e8"
+---
+
+# WarnWindows11
+
+### Purpose
+This module serves as a Windows Installer custom action that detects whether the target system is running Windows 11 and displays a warning message to the user if detected. It is designed to be executed during installation to inform users of potential compatibility concerns with the Windows 11 operating system.
+
+### Public Interface
+
+- **`OSWarning`** (class)
+  - `public static void Main(string[] args)` - Entry point for the custom action. Spawns `systeminfo.exe`, captures its output, parses it line-by-line for the string "MICROSOFT WINDOWS 11" (case-insensitive), and displays a message box with the warning resource `Properties.Resources.WARNING_WINDOWS11` if detected. All exceptions are silently caught and ignored.
+
+### Invariants
+- The process `systeminfo.exe` must be available on the target system PATH.
+- The resource string `Properties.Resources.WARNING_WINDOWS11` must be defined in the project's resource file.
+- The method always completes without throwing exceptions to the caller (all exceptions are caught and swallowed).
+
+### Dependencies
+- **Depends on**: `System`, `System.Diagnostics`, `System.Windows` (for `MessageBox`), and project resources (`Properties.Resources`).
+- **Depends on external executable**: `systeminfo.exe` (Windows system utility).
+- **Depended by**: Unclear from source alone; likely invoked by an MSI installer or setup executable as a custom action.
+
+### Gotchas
+- **Silent failure**: The `catch (Exception) { }` block swallows all exceptions without logging, meaning any failure (missing `systeminfo.exe`, permission issues, resource loading errors) will fail silently.
+- **Synchronous blocking**: `reader.ReadToEnd()` and `process.WaitForExit()` block the calling thread; this could cause installer UI freezes if run on the UI thread.
+- **Fragile detection logic**: Detection relies on exact string matching of `systeminfo.exe` output format ("MICROSOFT WINDOWS 11"), which could break if Microsoft changes the output format.
+- **No exit code handling**: The process exit code is not checked; `systeminfo.exe` could fail and the code would not detect it.
+
+---