Extract text from compressed CPIO archives (CPGZ)
To convert CPGZ archives to another format, you need Archive Utility or other Compressed software.
To convert other file formats to the "Compressed Archive" file type, you need software like Archive Utility or a similar tool.
A .CPGZ file is a Compressed CPIO Archive. It is created by combining a CPIO (Copy in, copy out) byte-stream archive with GZ (GZIP) compression. Unix and Linux systems historically use this format for backups, software distribution, and system restoration because it preserves file permissions and ownership metadata perfectly.
These files are typically processed by native command-line tools or GUI utilities like macOS Archive Utility, The Unarchiver, or 7-Zip for Windows.
Despite its technical efficiency, the .CPGZ format is a major source of frustration for average users due to a notorious macOS bug. When a standard ZIP file is corrupted, incomplete, or exceeds certain size limits, the built-in macOS Archive Utility often fails to extract it. Instead, it mistakenly compresses the broken ZIP into a .CPGZ file. Clicking the new .CPGZ file simply extracts it back into a ZIP, creating an endless, annoying loop. Furthermore, Windows systems cannot open these files natively without installing third-party software.
To bypass these extraction errors or share archives with Windows users, convert your .CPGZ file to a standard ZIP format. For Linux environments, converting to .TAR.GZ is recommended.
Convert.Guru analyzes your CPGZ file, detects the exact format, and lets you read the text inside.
Users also converted XLSB, RAR, RAR 3, RAR 4, RAR 2, ZIP, CPG, ODS, XLSX, PAGES, PDF, PGZ and PPTX files.
If you want to convert CPGZ file to PDF, ZIP, RAR, 7Z, TAR, GZ, BZ2, XZ, LZMA, CAB, ACE or ARJ, you can use Archive Utility or similar software from the "Archiving and Compression" category. In the File menu, look for Save As… or Export….
To convert XXE, 7Z, Z, PAK, LHA, DEB, UUE, TAR, LZH, ZIP, PKG or RAR files to CPGZ, try Archive Utility or another comparable tool in the "Archiving and Compression" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our CPGZ converter.