Texture too bright

Hello, I am editing a texture and a problem I have is that when I open the dds file to edit, the texture is too bright as the alpha channel is combined with the texture. I don't know how to fix this as on photoshop when you open the dds file it asks to load with transparency as an alpha channel but I am using GIMP and I don't know how to fix this. If there is a better photoshop alternative as I can't buy it, let me know.
You can PM me for more information.

Thanks

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