The File is a tgz file, that means that was packed with tar and compressed with gzip. In order to to uncompress if you are running on windows machines you can use 7-zip taht has support for gunzip and tar. If you are running on Mac or Linux is native in the OS.
Is not a ZIP file. http://www.7-zip.org/
Hope it helps.
True, The file is tgz and it seems like its an issue with Chrome browser that saves it as gz.
Just rename the file as .tgz and use 7zip or winrar.
Hope this helps,
As Sobolenko said it's a know issue with google chrome
If you're using it to download the tool. You must rename the file from: PanMigrationTool3i.gz to PanMigrationTool3i.tgz
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