Unpack XAP file

Just stupid question: how to unpack XAP file for WP8. I read a lot of posts like "its just a zip" but it wont work: zip signature is PK, but xap have PRE signature and wont be opened by any zip programs. I got xap from windows phone marketplace. Thanks for help!

How do I open an XAP file?

XAP files can be opened and viewed in a text editor, but they should not be edited manually. Instead, project files should only be modified with XACT.

Where can I download XAP files?

xap files. The site windowsphone.com/en-in/store now redirects to https://www.microsoft.com/en-gb/store/apps/windows-phone.

XAP really are ZIP file. If you build an application with Visual Studio, you'll be able to open the generated XAP file with most ZIP uncompressors.

The issue you're facing is that you've downloaded the XAP from the marketplace. Those are encrypted (to prevent piracy) and can only be decrypted by a Windows Phone device.