I am looking for a tool like Isolated Storage Spy to be able to access the Local Storage of applications I am developing for windows 10 mobile.
In other words is there any tool with or without a GUI that enables access to Local Storage for applications in W10 mobile?
Althought IsoStoreSpy is designed for Windows Phone 8 & 8.1 apps, but it can be also used for Windows 10 Mobile apps. To use it, we can download it form here.
Besides IsoStoreSpy, we can also use Windows Phone Power Tools. This is also a GUI tool that can be used for Windows 10 Mobile apps. With these two tools, we can access Local, Temporary and Roaming Folder.
Also as @Alexej siad, Isolated Storage Explorer (ISETool.exe) for Windows Phone 8.1 works just fine with Windows 10 Mobile apps. It is installed in the following location:
C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v8.1\Tools\IsolatedStorageExplorerTool
The usage of this tool is like How to use the Isolated Storage Explorer tool for Windows Phone 8. However for Windows Phone 8.1, it adds a <appxfolder:[root]> option for user to select Local, Roaming or Temp Folder.
<appxfolder:[root]> - Specifies the isolated store root for appx packages.
root can be one of the following (If root is not
specified, it's assumed to be "Local" by default):
Local - Local store root
Roaming - Roaming store root
Temp - Temp store root
For more help and examples just type ISETool.exe in command-line.