Released: May 8, 2026

Updates in V26.3

Features

• You can now append entries to existing 7z archives.
• Added the ability to adjust CAB archives combining entries in the folder.
• Added the ability to extract a ZIP archive from a read-only stream.
• Exposed the ZIP archive comment (archive-level) and now allows setting a comment for an individual entry.

Fixes

• Fixed issue with ZIP64 End of Central Directory properties when compressing large files.

Released: Feb 17, 2026

Updates in V26.1

Features

• Added support for CAB archive composition with MSZIP compression.
• Reduced allocations in various header composition routines.
• Introduced deferred sources for entry composition and immediate source closing for 7Z and CAB.
• Introduced a version for Java 10.
• Improved checksum performance with ARM64 intrinsics on .NET 10.

Released: Nov 30, 2025

Updates in V25.11

Features

• Reduced size of self-extracting executable module.
• Reduced memory consumption for XAR table of content.
• Prevented memory leak if not unsubscribed from entry events.
• Verified setting LZMA dictionary size for LZMA archive.
• Users can now set the number of fast bytes and literal context bits for LZMA algorithm within a ZIP container and the LZMA archive itself.
• Users can now set the number of fast bytes and literal context bits for LZMA algorithm within a 7z container.

Released: Nov 8, 2025

Updates in V25.10

Features

• Users can now set the number of fast bytes and literal context bits for LZMA algorithm within a ZIP container and the LZMA archive itself.
• Users can now set the number of fast bytes and literal context bits for LZMA algorithm within a 7z container.

Released: Sep 25, 2025

Updates in V25.9

Features

• Added support for extracting non-merged LZX archive.

Fixes

• Properly released file having wrong headers after archive fails to extract from it.

Released: Aug 22, 2025

Updates in V25.8

Features

• Added solid compression for encrypted 7z archives.
• Added optional Data Descriptor for Zip folder entry.
• You can now store host OS mark.

Fixes

• Fixed exception on solid compression exceeding trial size.

Released: Jul 28, 2025

Updates in V25.7

Features

• Added solid compression for plain 7z archives.

Fixes

• Proper instantiation of detected Arj archive.
• Correct commentaries for XarLoadOptions.

Released: Jun 26, 2025

Updates in V25.6

Features

• You can now cancel archive extraction via cancellation token.
• You can now verify archive disposal on instance operations.
• You can now cancel zip entry extraction with event handler.

Released: May 14, 2025

Updates in V25.5

Features

• Added the ability to detect uuencoded files by signature.
• Added the ability to store Unix file mode within uuencoded files.
• Provided methods for composition tar.lz4 combined archives.
• You can now include the block checksum in the frame of a LZ4 archive.
• You can now include the original content size in the frame of a LZ4 archive.
• Reduced memory allocations on LZ4 extraction.

Released: Apr 30, 2025

Updates in V25.4

Features

• Added the ability to compose LZ4 archives.
• Added the ability to store Unix file permissions in tar headers.
• Added the ability to extract tar.lz4 compressed archives with one method.
• Reduced memory allocation on LZMA decompression in 7z.
• You can now set Unix file mode on tar extraction.
• You can now keep Unix file mode for ZIP entry and set it on extraction in Unix.

Fixes

• Fixed issue with Aspose.Zip getting blocked indefinitely on PPMD Compressed zip archive.
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