Windows 8 WinRT app and phonegap - windows-8

I want to read a SSL(CA) Certificate kept in my application bundle but the problem is Windows Store App does not include native C# files.
1)Is there a way to give Native C# support in a windows store application.?
2)How to write phone gap plugins for Windows 8?

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Is it possible to build a android and iOS app using React Native in Windows Laptop?

Is it possible guys? As I know I can use the React Native eusing Windows Laptop but I can't build or produce a mobile ios app using Windows laptop?
Also what are the conflicts when developing android app and iOS app using Reactive Native
You can develop your iOS and Android app completely on windows, but it is correct, that you need a Mac to build and deploy it for iOS app. You could use a service like https://www.macstadium.com/ for this step. They offer access to macs on a monthly basis.
I'm working with RN since 2015 and I only found a few "conflicts":
1.) You have to double check styling between iOS and Android, since a few properties behave little different (like overview). But the RN team is constantly working on this and it gets better and better.
2.) If you need access to native device functions like InApp purchase API, you have to find Libraries, which work on iOS and Android.
All in all RN is a very good framework for writing cross platform apps. You should give it a try :-)

How do build and deploy WP8 app on device which is created from Mobile First 7.1?

I made simple Test app to check direct update in Mobile First 7.1.
Added WindowsPhone8 - Universal environment. Opened created native windows8 folder in Visual Studio. Now its showing three folders namely .Shared, .Windows8(Windows8.1) and .WindowsPhone8(WindowsPhone8.1).
Now I want to create xap of WP8 to deploy on device. How to do that? In 6.1 and 6.3 it was just deploy on device. Here I am not seeing that kind of option.
1) By design of Microsoft, Windows 8 Universal project comes with 3 projects within - Windows 8.1, Windows Phone 8.1 and shared.
Note that this is different from the Windows Phone Silverlight project.
2) Direct update feature is available only in Windows Phone Silverlight and not Windows Universal.

Build an android app on Windows Device

I have an Android app build using Ionic Framework. Now, how to deploy and test that android app on Windows phone (what tools are to be used and steps followed)..
1.Get Windows 8 OS.
2.Download and Install Microsoft Visual Studio Update 4
3.Then From there, you can use the IDE to create Cordova or Ionic Project( provided Ionic Plugins and Project have been Installed), Also you can also use the Command Line Interface to create your project, I'll advice the Command Line Interface as the best OPTIONS.
4.From the means, you can build your and will have the .appx (for WINDOWS STORE APP) that you can sideload to your actual device.
You need to register your windows phone to your windows phone developer account then you will be able to install it in your phone here is link, that show you how to register device.
https://msdn.microsoft.com/en-us/library/windows/apps/dn614128.aspx#prerequisites27
ionic is not supporting windows platform properly. i had developed application in android and ios using ionic but when i start to build those app for windows platform then so many feature of lonic-framework were not properly working. it require too many custom changes in ionic library as well.

Which platforms does Xamarin support?

I tried finding the information both on their website and on the Internet, but it appears that everywhere I look, a different list pops up.
Their front page says iOS, Android, Windows and Mac.
In their documentation (http://docs.xamarin.com/), only Android iOS,
Mac are mentioned at the docs front-page. I'm wondering does this
mean Windows has lesser priority compared to others.
On the Internet, I've found even more inconclusive information. Also,
it's hard to conclude what Windows means, mobile or desktop.
I've never used the product, but would love to try it for the game that I want to create, so I have two questions:
Can you give me a complete list of supported platforms (Android, iOS, Mac, Windows, Windows Phone, HTML5, Flash...)?
Can I target Facebook app with Xamarin?
Thanks in advance.
To update and extend Jason's answer there is now Xamarin.Forms that let us build cross-platform GUI for Android, iOS and Windows Phone. Looking at Xamarin's FormsGallery sample app I think it is fair to say that it de facto supports Windows Phone as well.
In addition to Xamarin.Forms there's always the possibility to use Xamarin.iOS, Xamarin.Android and Xamarin.Mac for platform customizations.
Xamarin.Mobile is in a preview release and supports Android, iOS and Windows Phone. It is used as an abstracted API of the native services (camera, geolocation etc).
However since you need the local SDK's installed for compilation you need a Mac computer to be able to deply for iOS. In order to compile for Windows Phone you need to use Visual Studio and the Xamarin Plugin, Xamarin Studio is not able to do this.
To conclude Xamarin supports development for
Android
iOS
Windows Phone
Mac
However not all of Xamarin's API's are implemented for all platforms.
Xamarin has three products
Xamarin.iOS - write iOS apps using C#
Xamarin.Android - write Android apps using C#
Xamarin.Mac - write Mac desktop apps using C#
Xamarin does not directly support Windows Phone apps. However, because you can write iOS and Android apps in C#, and C# is the native language for Windows Phone, using Xamarin allows you to write code that is usable across all three mobile platforms. Xamarin also provides some tools (like their Xamarin.Mobile library) that make this easier by providing a common interface to some common platform functions that will run on all three platforms.
You can write a mobile app that uses Facebook's API with Xamarin, but you cannot create a Facebook app (one that runs on Facebook).
You may find the actual list of additional platforms here.
On April 2019, it's listed as:
Android (incl. Android Wear)
iOS (incl. watchOS and tvOS)
Windows (UWP and WPF)
Linux (GTK)
Mac
Tizen
Windows Phone not supported since Xamarin 3.x

Is a WinJS/Javascript + Html5 app written for Windows 8 compatible with Windows phone 8?

Is a WinJS/Javascript + Html5 app written in javascript for Windows 8 compatible with Windows phone 8? From today's presentation, the recommended way is C#/XAML. It makes me wonder if my js app for windows 8 becomes compatible with WP8 (ofcourse with minor changes)?
Based on the information released at the June 2012 Windows Phone Summit, it appears that the development choices for Windows Phone 8 are:
XAML with C#/VB code
Native C++/C code
HTML 5 Browser Control
Based on their choice of wording, I infer that both C++/XAML and WinRT/HTML5 development models will not be available.
We'll know more once a preview of the WP8 SDK is released "later this summer".
WinJS/Javascript + Html5 app written in javascript for Windows 8 compatible with Windows phone 8?
No. Apps (not games) are still written in C#/VB.NET and XAML.
If your app runs in the browser, IE10 is able to render HTML5, but you'll not get any platform interop features.