id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
15440	PCLZIP_ERR_BAD_FORMAT (-10) : Invalid archive structure during plugin update	LongTail Video		"Currently, as part of our JW Player plugin we include several player skins so that users can customize the look of the JW Player.  These skins are packaged as zip archives.

For a while now we've been getting reports from our users having difficulty performing the automated update/install.  These users are receiving a PCLZIP error which claims the plugin archive is invalid.

From looking at the source code I see that WordPress first attempts to use the ZipArchive PHP module to unzip plugin packages.  This always works for users updating our plugin.  If this is not available it then uses a fallback library called PCLZIP.  After some experimentation, it seems that PCLZIP has difficulty unzipping archives that contain archives.

Is this a known issue from your experience?  If so, is there a workaround other than removing the zip skins from our plugin package?"	defect (bug)	new	low	Future Release	Upgrade/Install	3.0.1	normal		needs-patch external