Unlike it's XML configuration, the Yaml configuration seems not to expand the %BASE% variable.

Steps to reproduce

Minimal service with an pidfile path containing %BASE%:

id: example-service
name: Example service
description: Example.
executable: '%BASE%\example.bat' # Expands correctly

extensions:
    - id: killRunawayProcess
      enabled: yes
      className: WinSW.Plugins.RunawayProcessKiller.RunawayProcessKillerExtension
      settings:
            pidfile: '%BASE%/example.pid' # Uses %BASE%
            stopTimeOut: 5000
            StopParentFirst: true

Install and start the service.

Wrapper log:

INFO  - Recording PID of the started process:8896. PID file destination is %BASE%/example.pid
ERROR - Cannot update the PID file %BASE%/example.pid

Followed by a related System.IO.DirectoryNotFoundException.

Environment

• WinSW version: 2.10.1
• WinSW package type: .NET 4.6.1
• Windows version: 10
• Wrapped executable and version: Any

Possible Solution

Probably only a missing variable expansion.