But NCrunch looks in a different folder and I get an exception
System.IO.DirectoryNotFoundException : Could not find a part of the path 'C:\Users\[removed]\AppData\Local\NCrunch\5916\83\VS\ProjectName\CommonsTests\bin\Debug\Ranges\Holdem\3B16.range'.
How do I make Ncrunch to look in the [ProgramOutputFolder]\Ranges\Holdem\ folder?
If for some reason you don't want NCrunch to copy the file to the workspace (for example, if it's really big and copying it just isn't resource efficient), the NCrunch.Framework.Environment.GetOriginalSolutionPath() can be used to find your original solution when running inside NCrunch's test environment.