I was having the same problem with some QuickTime video files. Found the following suggestion in a response to a blog post from this URL:
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Description: CPGZ file is a Gzip Compressed CPIO Archive. CPGZ files can be created and extracted using ditto utility. Ditto is a command-line utility that ships with Mac OS X. 7Zip for Mac OS is a great app that should be included on iTunes. As productivity is a concern on all Apple devices, the development of 7Zip would be a great delight for all its users. It is the most powerful and secure archiving and file compression tool in its category and field. So, you are one of the opulent citizens of the society.
It seems to be correct; ie, I've exercised some patience and the files end up being complete (in my downloads file) without even clicking the zip. I went back and deleted the problematic .zip and .cpgz files and started with a fresh download, then waited for it to do its thing before attempting to open any file.
Sparty March 13, 2012 at 12:01 am
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when a large .zip file is being downloaded, it is temporarily in two parts. these two parts should be a .zip file (very small) and a .part file. if the .zip file is opened before the download is completed, then the .cpgz file will result and the loop will continue.
The solution then, is simple! just make sure the download has finished by checking your download pane or wait for the .part file to disappear/combine into the full .zip file!
Hope it works for you, as well. Thanks to the aforementioned blog and Sparty.
1 extension(s) and 0 alias(es) in our database
Below, you can find answers to the following questions:
Gzip Compressed CPIO Archive
CPGZ file is a Gzip Compressed CPIO Archive. CPGZ files can be created and extracted using ditto utility. Ditto is a command-line utility that ships with Mac OS X.
Category: Archive files
Application:7-Zip
Mime-type: application/octet-stream
Magic string (ASCII): -
-
-
LH ARC Compressed Archive
Compressed Microsoft Cabinet File
Tape Archive
Compressed File
7-Zip Archive
Other types of files may also use the .cpgz file extension. If you have helpful information about .cpgz extension, write to us!
Is it possible that the filename extension is misspelled?
We found the following similar extensions in our database:
ArcGIS Codepage
CATS PG File
Linux Drivers Archive
StreamLync Download Archive
AssaultCube Map
cPGS Addon Package
LoseThos C+ Source Code
The .cpgz filename extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Can't open a .cpgz file?
If you want to open a .cpgz file on your computer, you just need to have the appropriate program installed. If the .cpgz association isn't set correctly, you may receive the following error message:
Windows can't open this file:
File: example.cpgz To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer. To change file associations:
Supported operating systems
Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android
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CPH file extension ยป
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