DwmUnregisterThumbnail function (dwmapi.h)

Removes a Desktop Window Manager (DWM) thumbnail relationship created by the DwmRegisterThumbnail function.

Syntax

HRESULT DwmUnregisterThumbnail(
  HTHUMBNAIL hThumbnailId
);

hThumbnailId

The handle to the thumbnail relationship to be removed. Null or non-existent handles will result in a return value of E_INVALIDARG.

If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Unregistering DWM thumbnail relationships must be done within the process that registered the relationships.

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	dwmapi.h
Library	Dwmapi.lib
DLL	Dwmapi.dll