I found these file access related functions:
Function block Short descriptionFILE_CLOSECloses a file.
FILE_OPENOpens/creates a file.
FILE_READReads data from a file.
FILE_REMOVEDeletes a file.
FILE_SEEKMoves the current file pointer to a new position.
FILE_TELLDetermines the current position of the file pointer in a file.
FILE_WRITEWrites data to a file.
Are there any meta operations - such as :
FILE_COPY (for example from SDcard to USB_Memory
FILE_MEDIA_ACCESSIBLE (is SDcard inserted ?)
FILE_MEDIA_FREESPACE