[Windows platform only] access denied on save - offer to elevate permissions

[keith-hall]

Summary

Sublime Text doesn't show the UAC prompt to elevate permissions for saving a file in a restricted folder on Windows.

Steps to reproduce

1. On Windows, with User Account Control enabled, open a file in a restricted location, like (a subfolder of) C:\Program Files.
2. Make any change to the file
3. Save it

Expected behavior

ST3 should invoke a UAC dialog to elevate permissions so that the file can be saved.

Actual behavior

error: Unable to save C:\Program Files (x86)... Error: Access is denied.

Environment

• Operating system and version:
  • [X] Windows 7 x64
  • [ ] Mac OS ...
  • [ ] Linux ...
• Sublime Text:
  • Build 3113

Additional notes: It works on Linux, with it's equivalent of UAC elevation.