How can i tell if a file is lzop or lzma?

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I have files that are compressed with both lzop and lzma and without proper extensions to their filename. e.g. "filename" instead of filename.lzo or filename.lzma

how can i tell if they are compressed in their respective format?

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user1093283 On

Mines compressed with Lzop v1.01 contains as 2nd, 3rd and 4th bytes "LZO", those compresed by mean of 7Zip/Lzma contains "7z" as first two bytes, just a clue and my 2 cents.