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.