2.4.2.1 Fixed Length Property Entry

The entry for a fixed length property has the following structure.

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
Property Tag
Flags
Value
...

Property Tag (4 bytes): The property tag of the property.

Flags (4 bytes): Flags giving context to the property. Possible values for this field are given in the following table. Any bitwise combination of the flags is valid.

Flag name	Value	Description
PROPATTR_MANDATORY	0x00000001	If this flag is set for a property, that property MUST NOT be deleted from the .msg file (irrespective of which storage it is contained in) and implementations MUST return an error if any attempt is made to do so. This flag is set in circumstances where the implementation depends on that property always being present in the .msg file once it is written there.
PROPATTR_READABLE	0x00000002	If this flag is not set on a property, that property MUST NOT be read from the .msg file and implementations MUST return an error if any attempt is made to read it. This flag is set on all properties unless there is an implementation-specific reason to prevent a property from being read from the .msg file.
PROPATTR_WRITABLE	0x00000004	If this flag is not set on a property, that property MUST NOT be modified or deleted and implementations MUST return an error if any attempt is made to do so. This flag is set in circumstances where the implementation depends on the properties being writable.

Value (8 bytes): This field contains a Fixed Length Property Value structure, as specified in section 2.4.2.1.1.