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What was the score in the end?
As pI said, it's probably because it's an Index file.
In that case go to Image > Mode > RGB Color
If a layer is locked, open the layers palette (windows > layer), select the layer that's locked and then click the lock at the top of the layers palette.
If it is a gif animation, open the file in photoshop as normal and then open the animation window - Window > Animation
All these depend on which version you are running but generally they are the same.
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