I need a way to extract these, they contain sprites.

Thomas.zip

There are some log files with this repeating entry:
Graphics Card Surface description :-
[16/Jan/2001:12:39:31 GMT Standard Time] 16 Bit Graphics card
[16/Jan/2001:12:39:31 GMT Standard Time] Depth R: 32  G: 64  B: 32
[16/Jan/2001:12:39:31 GMT Standard Time] Shift Values R: 11  G: 5  B: 0
[16/Jan/2001:12:39:31 GMT Standard Time] Masks R: f800  G: 07e0  B: 001f

Presumably the sprites are stored in RGB565 (16 bit), though I haven't managed to interpret any non-distorted textures yet. You should probably focus on files that are definitively sprites, like the ones in Graphics\Icons\ReminderBarwith, since some of the .oxy files look like they are just 3D meshes with no image data.

Here's struct. But i think there are no textures...

local uint32 i;

uint32 Unknown_0;
uint32 Unknown_1;
uint32 ResourceCount;
uint32 ResourceOffset[ResourceCount];

for (i=0; i < ResourceCount; i++)
{
    FSeek(ResourceOffset[i]);
    struct
    {
        uint32 Unknown_0;
        uint32 Unknown_1;
        uint32 Unknown_2;
        uint32 Unknown_3;
        uint32 ResourceSize;
        byte ResourceData[ResourceSize];
    }Resource;
}

 

Let me see if they work.