How to edit an XML file in Streamingassets from my hololens?

Hi!

I have a really frustrating problem with my app, I'm using Vuforia and I'm trying to edit and save an xml in streamingassets from runtime, however, I get the following exception:

Unauthorizedaccessexception ... access to the path is denied.

I use the following when I get this error(only on the hololens, not in the editor):

Code (CSharp):

1. var path = Path.Combine(Application.streamingAssetsPath, "xx.xml");

but when I save something to:

Code (CSharp):

1. var path = Path.Combine(Application.persistentDataPath, "xx.xml");

it works perfectly. I can't do this though because of Vuforia can only access image targets in Streamingassets. So does anyone have an idea what I'm doing wrong, what can I do to gain access to the streamingassets folder?

Thank you!