relative path unity

//get the path depending on system (see bellow)
string workingDirectory = Application.dataPath; 

//Unity Editor: <path to project folder>/Assets
//Mac player: <path to player app bundle>/Contents
//iOS player: <path to player app bundle>/<AppName.app>/Data (this folder is read only, use Application.persistentDataPath to save data).
//Win/Linux player: <path to executablename_Data folder> (note that most Linux installations will be case-sensitive!)
//WebGL: The absolute url to the player data file folder (without the actual data file name)
//Android: Normally it points directly to the APK. If you are running a split binary build, it points to the OBB instead.
//Windows Store Apps: The absolute path to the player data folder (this folder is read only, use Application.persistentDataPath to save data)