Link to email or PDF on Android

I can not run properly the links to the pdf or emails on Nexus 7 (Android 4.4.3) using the Adobe Content Viewer.

This is the code I use for buttons that link to a pdf:

window.open("pdf/brochure.pdf");

In this case, open the browser in spite of Adobe Reader is installed.

This is the code I use on the button that create an e-mail:

window.location.href = "mailto:WRITE HERE YOUR EMAIL?subject=MY BROCHURE&body=Thanks!"

If I click a window opens always in Adobe CW with the following text:

Web page not available

It was not possible to load the web page at mailto:WRITE HERE YOUR EMAIL?subject=MY BROCHURE&body=Thanks!

error:

net :: ERR_UNKNOW_URL_SCHEME

If I click on the URL then it works properly and asks me which email client I want to use to send the email.

With a Samsung S2 and Android 4.1.2 instead everything is working correctly.

Even from your browser and Ipad no problem.

I do not understand why ...