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Zip file ArchiveFactory.Open throws exception for Legacy compressed zip file #502

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opened 2026-01-29 22:12:59 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 22:12:59 +00:00
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Originally created by @Malshan90 on GitHub (Mar 3, 2022).

Hi,

The zip file I'm using use Zip 2.0 (Legacy) compression. When I try to open it via ArchiveFactory.Open, I get below exception,
"Cannot determine compressed stream type. Supported Archive Formats: Zip, GZip, Tar, Rar, 7Zip"
I'm using ArchiveFactory Open(string filePath, ReaderOptions? options = null) method. All AES encrypted file can be open and extract without any issues.

Could you guide me here, This is the first time we got Legacy files from a client. Thing is we do need to support legacy method in our system as any new client can be sending legacy compressed files.

Thanks in Advance.

Originally created by @Malshan90 on GitHub (Mar 3, 2022). Hi, The zip file I'm using use Zip 2.0 (Legacy) compression. When I try to open it via ArchiveFactory.Open, I get below exception, **"Cannot determine compressed stream type. Supported Archive Formats: Zip, GZip, Tar, Rar, 7Zip"** I'm using ArchiveFactory Open(string filePath, ReaderOptions? options = null) method. All AES encrypted file can be open and extract without any issues. Could you guide me here, This is the first time we got Legacy files from a client. Thing is we do need to support legacy method in our system as any new client can be sending legacy compressed files. Thanks in Advance.
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Reference: starred/sharpcompress#502
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