Xceed Zip for COM/ActiveX on x86/x64 Documentation
Xceed Zip control reference / Xceed Zip control error codes / xerSeekInZipFile constant
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    xerSeekInZipFile constant
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    Value

    501

    Description

    Cannot seek in the zip file.

    Tips

    This can happen when the library is looking for signatures that identify the zip file but is unable to perform a seek operation. Make sure you are using a random-access device.