Repo: https://github.com/harry-1012/OSS/blob/master/Download/REG/Hide%203D%20object.reg

Raw: https://raw.githubusercontent.com/harry-1012/OSS/master/Download/REG/Hide%203D%20object.reg

Windows Registry Editor Version 5.00
; Remove 3D Objects from This PC
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{0DB7E03F-FC29-4DC6-9020-FF41B59E513A}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{0DB7E03F-FC29-4DC6-9020-FF41B59E513A}]
; Hide 3D Objects from Save dialog
[-HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\FolderDescriptions\{31C0DD25-9439-4F12-BF41-7FF4EDA38722}\PropertyBag]
"ThisPCPolicy"="Hide"
; Pictures
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FolderDescriptions\{0ddd015d-b06c-45d5-8c4c-f59713854639}\PropertyBag]
"ThisPCPolicy"="Hide"
... (remaining registry entries unchanged) ...

Apply: create .reg file, double-click, then restart Explorer or reboot.