wrong guess in determine_ext

[piotr5151]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.04.17. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.04.17

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• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

determine_ext helper dosen't check know extension and return script extension for url in format: //www.host.com/vod.php?code=1234 - helper returns php extension in that case

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[dstftw]

This is expected behavior.