Notepad++ should work now.

tests/README.md

@@ -108,6 +108,33 @@ reader's `docs/testing/wine-accessibility.md` for current evidence and live
 acceptance gates. Run Xvfb fixtures sequentially; concurrent automatic display
 allocation can collide.
 
+## Notepad++ / Scintilla checks
+
+Use a locally available 64-bit Notepad++ executable:
+
+```sh
+xvfb-run -a python3 tests/menu_integration.py --build-dir build --fixture scintilla --notepadpp-exe /path/to/notepad++.exe
+```
+
+The runner copies the executable and model XML files into a temporary directory,
+uses local configuration, disables plugins/session restoration, and opens a
+disposable UTF-8 document in its private Wine prefix. The user's running
+Notepad++ and documents are untouched. The fixture uses actual `SendInput`
+arrows, Ctrl+Right, Shift selection, Delete, Backspace, undo and menu return;
+checks Ctrl+X, multibyte accented characters, emoji, a document over one million
+bytes and truncation at a surrogate pair; and verifies document length
+after a read-only deletion attempt. Add `--late-helper` or `--restart-helper`
+to check attachment and reader restart while the editor stays open.
+
+After installing, restart Cthulhu and close/reopen Notepad++ so its process
+loads the new DLL. In a disposable document with several lines, accented
+characters and emoji, check Up/Down line reading and Left/Right character
+reading in both directions. Check Ctrl+Left/Right words, Shift selection and
+unselection, Backspace/Delete, undo, Alt/Escape return and switching document
+tabs. Repeat ordinary Wine Notepad editing, menu navigation, and password
+fields in other applications for regressions. Check speech and physical
+braille separately. These recorder tests do not establish either live output.
+
 ## List-view checks
 
 ```sh