Problem:

Byte stream I/O routine CBL_OPEN_FILE failes with error 194 when the file is large

Resolution:

Setting ACCESS-MODE = 65 corrects the problem - the call will fail if the underlying operating system does not support large files

Byte Stream IO calls work with files up to 4 Gb,  Over 4 Gb there is a requirement  to set 1 of 2 flags to get the open to work:

- bit h"40" of the open-mode field (second parameter) or;

- bit h"10" of the sharing mode field (third parameter).

Using method 1 you will get an error if the open is attempted on a system which does not support 64 bit file systems (e.g. Windows 95).

Method 2 will give you a successful open in all operating systems, but tells the run-time that no locking calls will be attempted on the file.  Any call to e.g. CBL_GET_LOCK will result in an error if the file has been opened with this bit set.