xcall SIZE, fspec, bytes

SIZE.SBR returns the size of the specified file in bytes.

fspec  (String)  [in]

is specification of the file (in AMOS or native format).

bytes  (F,6)  [out]

returns the number of bytes. If the file does not exist, -1 is returned. A return value of 0 indicates that the file exists but contains no data.