Describe the scenario and benefits that the feature supports.
I want set @Source attribute of the File element to the parent folder of the Wix project. Double dot is standard way to do this (something like "$(var.ProjectDir)..\Resources\File.txt").
If I use this kind of relative path with current version of Wix (v3.11) there is an error in during package generation: ICE03: Invalid Filename; Table: File, Column: FileName, Key(s): FILE_File.txt.
Describe how you're accomplishing the feature today (if possible).
I'm using configuration file in my project to define common variable with absolute path to the parent folde.
Describe what you'd like the new feature to do.
When generating contents files relative path should be converted to absolute path. In C# it can be accomplished with Path.GetFullPath((new Uri(relative_path)).LocalPath);