hi. it says what i put in the last post - that it is a gzip compressed data with extra field but when i read it with zless it is nonsense and contains mostly this string ^@ intermixed with ascii characters
Re^4: (OT) help reading a bgzip file
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Looking at http://samtools.sourceforge.net/SAM1.pdf (which I think is the reference for the file format used by bgzip) it looks like the payload data (BAM) in the bgzip file is not ascii text - that would explain why you are seeing non-ascii text when you run it through zless.