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[DX9] Loading assets from memory

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Hello good folk

I wish to load assets from a game that I bought years ago. The game uses a costum file format which bundles textures (DDS) and mesh data in to one file.
I managed to extract the DDS and compare the DDS file to the costom file using a hex editor. The DDS image is found inside the asset file with no deviations.

I load the asset file using Overlapped I/O to memory. How do I proceed in allocating (D3DXLoadTextureFromMemory, D3DXLoadMeshFromMemory) these to:
LPD3DXMESH mesh;
D3DMATERIAL9* material;
LPDIRECT3DTEXTURE9* texture;
DWORD numMaterials;

Such that I can draw it?

EDIT: The header of the DDS is different.

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Basically what I need to know is how to load costum file formats into a mesh objects.

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