With Windows 10 SMB1 was disabled but can be activated from Windows Features. Follow the steps below. This will allow you to connect your PlayBook for WiFi access to your media folder.
To Turn On or Off Windows Features from Windows Features
1. Open the Control Panel (icons view), and click/tap on the Programs and Features icon.
2. Click/tap on the Turn Windows features on or off link on the left side.
3. Scroll down until you see the SMB1 and open the dropdown. Select the 2 checkboxes. See Image below.
4. Most of the time a Re-Start of your Computer is required. This should allow you to access your PlayBook from Windows 10 via WiFi.