Hide the dropdown list of recent files: registry value NoFileMruUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Comdlg32

Policy ID
NoFileMRU
Scope
User Configuration
Supported on
At least Windows 2000
Source
Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category
Windows Components › File Explorer › Common Open File Dialog

Registry

NoFileMru

-User