Nikolay Sivov (@nsivov) commented about dlls/shell32/shlview.c:
static HRESULT WINAPI FolderView2_SetCurrentFolderFlags(IFolderView2 *iface, DWORD mask, DWORD flags) { IShellViewImpl *This = impl_from_IFolderView2(iface); - FIXME("(%p)->(0x%08lx 0x%08lx), stub\n", This, mask, flags); - return E_NOTIMPL; + + TRACE("(%p)->(%#lx %#lx).\n", This, mask, flags); + + if (flags == FWF_NONE) + This->FolderSettings.fFlags &= ~mask; + else + This->FolderSettings.fFlags |= flags & mask; That's not how this usually works. Mask is used to specify flags that you want to change. So first you would unset bits that are in a mask but not in flags, and then set bits that are in mask and flags.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/2628#note_29582