Files recognized as gzip but not compressed


Hi everyone!
I'm new to Linux, working with Ubuntu 20.04 in a virtual machine (Virtual Box 6.1). I have a shared folder in my Windows desktop, so I can work with it in the machine. I have a problem wirh BAM files: they are recognized as gzip but they do not have extension .zip or similar. Anyway, when I try to extract them I have the message: an error occurred while extracting files. If I add the .gz extension I get to extract them but they are higher and give error with other applications such as IGV. In Windows they work fine, as well as in a computer with Linux as operative system. So I think it is a problem of the virtual machine. Anyone knows how can I solve this? Thank you.






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