DosOpen Parameter - fsOpenFlags

fsOpenFlags (ULONG) - input

The action to be taken depending on whether the file exists or does not exist.

This parameter is not used in the raw file system.

Possible values are shown in the following list:

Bits

Description
31-8
Reserved, must be 0.
7-4
The following flags apply if the file does not exist:

0000

OPEN_ACTION_FAIL_IF_NEW
Open an existing file; fail if the file does not exist.
0001
OPEN_ACTION_CREATE_IF_NEW
Create the file if the file does not exist.
3-0
The following flags apply if the file already exists:

0000

OPEN_ACTION_FAIL_IF_EXISTS
Open the file; fail if the file already exists.
0001
OPEN_ACTION_OPEN_IF_EXISTS
Open the file if it already exists.
0010
OPEN_ACTION_REPLACE_IF_EXISTS
Replace the file if it already exists.

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