For the same reason that:

cat foo.html bar.gif baz.html > quux.gif

will create a file that is neither valid HTML nor a valid GIF.

(Interestingly cat bar.gif baz.html > quux.gif does create a valid GIF.)

In reply to Re^3: Display gif in CGI page by tobyink
in thread Display gif in CGI page by PhillipHuang

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