OK contents of the pc0 file:
Filesystem = L:CrossDOSFileSystem
Device = mfm.device
Unit = 0
Flags = 1
Surfaces = 2
BlocksPerTrack = 9
Reserved = 1
Interleave = 0
LowCyl = 0
HighCyl = 79
Buffers = 5
BufMemType = 0
StackSize = 600
Priority = 5
GloVec = -1
DosTye = 0x4D534400
I went into information on the pc0 icon but I couldn't find Unit tooltype? It just says pc0 (project) and gives some normal file attributes?