An recognized XDA Developer GoodDayToDie has developed an open source application called WP8 File Access Web Server that allows you to access your WP8 Mobile’s file system via LAN. The app makes your mobile’s file system visible to sandbox and also lets you to download files. Using the app is very simple, as you will have to sideload the app, connect to LAN and run the application. Then you will have to launch the client web browser from the same LAN and go to your mobile’s LAN IP address. Upon successful access, you will be presented with an index page where you can input desired path into the text box and click on Get Files to view the file list. Now click on any file to download it.
If you are not aware of what is sideload means, then here’s it is: Sideload is a popular term used in the internet, which means the process of transferring the data between two local devices. Particularly between computer and a device such as mobile, tablet connected on the same network.
According to the developer, WP8 File Access Web Server is still under development. So you will find few glitches, but it is usable. Download WP8 File Access web server from original thread on XDA.
