Where can I find files saved in ApplicationData.Current.LocalFolder while developing a Windows Phone 8.1 app?

To transfer/access files on Windows Phone Emulator (also works with device) you can use:

• Isolated Storage Explorer tool - here is a good link how to do it, and also one useful here.
• a very nice tool is Isolated Storage Spy - which now supports also WP8.1
• Windows Phone Power Tools from here - you will have to check if that already works with WP8.1.