Testet your preset from 19041.388.200709-0342.VB_RELEASE_SVC_PROD1_CLIENTMULTI_X64FRE_PT-PT (entreprise version from
here) and change from Disabled to Disabled (Locked) then it’s working, but then you can’t change it back if needed before you delete these 2 lines in registry:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\current\device\Start]
"AllowPinnedFolderPictures"=dword:00000001
"AllowPinnedFolderPictures_ProviderSet"=dword:00000001
Or you can change the behavior from GPO settings on a liveinstall (se attached image) and copy the hidden folder //Windows/Sytem32/GroupPolicy in to your mounted image in NTlite.