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Home/ Questions/Q 540677
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T10:15:54+00:00 2026-05-13T10:15:54+00:00

I have an XML file format .zfo that is compressed using zip algorithm. I

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I have an XML file format .zfo that is compressed using zip algorithm. I need to remove this compression from the file, so that it is in usable XML form. Here is the file.

How can I remove this compression, or decompress this XML file?

It’s not like you might imagine i.e: .zip file containing an xml file. Instead the byte[] that’s written to the file is zip compressed.

Thanks in advance.

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  1. Editorial Team
    Editorial Team
    2026-05-13T10:15:54+00:00Added an answer on May 13, 2026 at 10:15 am

    That file isn’t zip compressed at all. It appears to be some xml that’s embedded in a certificate, issued by the Czech Post Office. The actual message looks to be encoded in some kind of base64 variant.

    Call your post office.

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