Unpacking .crx extension with winzip

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Unpacking .crx extension with winzip Myriam Abramson 10/09/14 13:29
Hello!

Winzip does not want to unpack my .crx extension even if I rename it as .zip. Is there a workaround to that? I know that 7-zip works but I can't ask my users to download 7-zip.

Thanks,
melipone
Re: [crx] Unpacking .crx extension with winzip Tom Coleman 10/09/14 13:58
I'm curious why your users need to unpack the zip / crx

I know of no useful purpose of crx files.  Please teach me! :)

zip = upload to chrome web store, to distribute
zip = people can zip / unzip
crx = old way to install locally, or outside of chrome web store, which no longer works unless in chrome developer install.
crx = proprietary compression format, the chrome browser will extract to C:\Users\___username____\AppData\Local\Google\Chrome\User Data\Default\Extensions, but then disable it due to security.


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Re: [crx] Unpacking .crx extension with winzip Scott 10/09/14 14:06
Crx files are still the packaging format that Chrome uses to install and update extension behind the scenes. They are just a zip file with some metadata and a signature prepended. 7zip ignores the prepended metadata and starts reading from where the zip starts. Winzip looks at the prepended data and says: "Nope! that isn't a zip file." So your choices are (1) use an unzipper that ignores prepended data or (2) cut the prepended data off of the start of the file.
Re: Unpacking .crx extension with winzip Dave Cooliave 11/09/14 12:45
Try an extension called Chrome extension source viewer https://chrome.google.com/webstore/detail/jifpbeccnghkjeaalbbjmodiffmgedin. It will allow you to select the local file and export in zip format.