Here is a compact yet deep technical exploration of loading Windows 8 user apps.
Related topics elsewhere on this same website (WilsonMar.com):
Windows 8 Store App package size is limited to below 2 gigabytes maximum per package.
Manifest elements are listed here.
"Sideloading" is installing apps without going through the public Windows App Store.
Windows Phone apps are deployed as .xap files containing files such as XMLs and compiled DLLs for execution by Silverlight player. So when opened using Notepad, it looks scrambled. It doesn't contain source code.
By default windows explorer doesn’t know how to open XAP files. Run these registry changes enable Windows to read .xap files.
REFERENCE: How to install apps from SD card.
On Windows Phone 8 with microSD card support (Nokia Lumia 820, HTC 8S, Samsung ATIV S), .xap files still need to come from the Windows Phone Store, so a data connection and an active Microsoft account are still required to successfully install apps.
In a corporate environment, Microsoft System Center 2012 Configuration Manager SP1 automatically send apps to desktops and devices which run Windows 8 Enterprise edition and attach to a corporate Active Directory domain.
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