Hi Popa,
There is DIRECTV Remote app available in Windows Store. Open this link from web browser and then click on “View in Windows Store”.
http://apps.microsoft.com/windows/en-us/app/directv-remote/fed7045a-e65b-4f09-bbc7-92e586e87d9a#
The third party Windows 8 apps are developed by the respective vendors of the software. If you are not able to find Windows 8 app from store you need to contact their support site for better assistance. Here are some reasons why you might be unable to find or install an app from the Windows Store:
Why can't I find or install an app from the Windows Store?
http://windows.microsoft.com/en-IN/windows-8/why-find-install-app-windows-store
Hope this helps, if you need further assistance on Windows let us know we will be glad to help.