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I don't know how else to phrase this question, but I stumbled upon a file which I know from the header is gzipped (1F8B0800) but I am unable to recreate the file no matter what I try (including gzip on OSX, gzip on Linux, compress, and zlib). Even weirder, the gzip -1 output of the gunzipped input is smaller than the input. And weirder still, I see some plaintext (like PNG headers) at near the 80% of the file (followed by more of what I believe is compressed data). I don't think it's unrelated data though because gunzip doesn't give the "trailing garbage ignored" message.

I guess my question is that is there some older version of gzip that gives an output that is larger than a modern gzip -1?

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Just because the header has that value doesn't actually mean its an archive file. What other evidence do you have to support your claim its an archive file? –  Ramhound Feb 27 '13 at 12:43
    
I have successfully ran "gunzip" on the file and the output is a valid file. –  Yifan Feb 27 '13 at 16:57

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