A full path on RISC OS included the filesystem:

  ADFS::IDEDisc4.$.Games.!Repton.Arctic

ADFS is the filesystem, IDEDisc4 is the disc name, $ is the root directory, Games is a subdirectory, !Repton is an application directory (since it begins with !) and Arctic is a file within the application directory, not normally referenced by users.

  Resources:$.Apps.!Edit

is the application !Edit from the built-in ROM.