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I'm a new guy on windows phone environment, and I wonder why I can't install another app out from marketplace. And I also try to develop an app for windows phone after finished I put the xap file from bin to the Onedrive then download that file, but the message said that the windows phone didn't support this file type. Do you have any idea why it happens? My phone os version is 7.5. Sorry for the silly questions.

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The design is that you can install apps only from the marketplace. Developers can "developer unlock" the phone which enables another kind of installation, but that is not intended to be used to install apps you didn't write. You have to deploy to the phone from your developer machine. – Kate Gregory Aug 27 '12 at 15:54
up vote 3 down vote accepted

You cant install an app like that. You can only do so using the deployment tool that comes with the developer kit. For that your phone must be developer unlocked. Click the link for more information about it: (Recommended)

Also if you like to install a downloaded xap file, please check the following link for information: and

Althought the above two processes are not recommended!

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well thank you, I'll try. – Raditya Kurnianto Aug 27 '12 at 8:25
Note that to developer unlock your phone you have to register an account with the Windows Phone Dev Center (formerly AppHub). You can get a free account if you're a student with a DreamSpark account; otherwise, it's $99 per year. – Michael Itzoe Aug 28 '12 at 18:45

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