The value
Under HKCU\Software\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}\InprocServer32 — creating the key with an empty default value has Explorer's context-menu resolver fall back to the traditional layout for your account. Sign out/in, or restart Explorer, to apply.
The pattern behind the pattern
```HKCU\Classes```
your per-account overlay view over HKCR; machine side unaffected
```InprocServer32``` empty default
marker value: Explorer sees the marker, not a handler DLL, and defaults to classic
Deletion
the honest restore — delete the key tree; Windows 11 menu returns next session
Trade-off to keep in your prose: classic menu restores per-vendor extensions to first-class visibility — and also restores the 2008-vintage list layout, including items you forgot were in there. Trust-by-documentation means naming the trade, not pretending it doesn't exist.
ProofTune ProjectEngineering notes — every claim here names the bytes a real tool touches. Verify first, install second.