Works:
profile.ini:
path.project.appDir = ""
config.ini:
path.phocoa = ##path.project.appDir##/externals/phocoa/phocoa
Fails:
profile.ini:
path.project.appDir = ""
path.phocoa = ##path.project.appDir##/externals/phocoa/phocoa
path.phocoa ends up as only expanded ##path.project.appDir## and skips the rest of the string.