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OpenGL DirectX SetPrivateData

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Hello, I made a function where the user has to pass data so it can also load textures on it's own. In OpenGL it is already working perfect but all the info I can find on SetPrivateData function isn't enough to explain it exactly.
// REF_CreateImageFrom create an image from user passed data
int REF_CreateImageFrom(SPXImage *Image, void *Data, int Width, int Height, int Type)
	GUID guid;

	CurrentImgNr ++;
	dx_Textures.resize(CurrentImgNr + 1);
	Image->imgnr = CurrentImgNr;
	Image->Alpha = 255;
	Image->RotDeg = 0;

	dx_Textures[CurrentImgNr]->SetPrivateData(guid, Data, sizeof(Data), NULL);

	return 0;

First of all what is GUID ? Second of all what am I doing wrong that it locks up ? ( An xp program crash dialog )

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