Help me with HPL editor! please! it's error?or what is it?

[Your Computer]

Sure here is it http://www.mediafire.com/?l88826uztco3o4e You think matter is this file?

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Yes i can open .mat in Matireal Editor

Let's try something: Open the level editor (if not already open) and pick Decals on the left and click on the "..." on the right. In the file browser of the level editor, double-click the ".." until you're in the Program Files folder. Then go back into the Amnesia folder under Program Files and navigate to where the decals are (should be redist/textures/decals in the folder Amnesia is installed in). Does it show the materials now?