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The alternate (key) file appears to be invalid.  Verify that it is a valid Figger™ file.

No image was found in this GIF file.  Verify that it is a valid GIF file.

There appears to be a problem with the contents of the GIF file.  Verify that it is a valid GIF file.

There is not enough storage to read the file.[1]

The file version is not supported.  Only GIF version 87a and 89a are supported.

This does not appear to be a GIF file.  Only GIF graphic images are supported.