Table- Binary I/O Modes
 
Mode
 
Description
 
1
 
the file must exist and is opened for read only.
 
2
 
the file must not already exist (if it does an error will be re turned) and the file is created read/write.
 
3
 
the file is created read/write and when closed, any pre-ex isting file will be deleted.
 
5
 
the file must exist and is opened for read/write.
 
7
 
a temporary file is created. The file will be deleted when it is closed.