[MS-OVBA]: _VBA_PROJECT Stream: Version Dependent Project
Information
By mrsgit09
Archived: 2026-04-05 20:25:09 UTC
The _VBA_PROJECT stream contains the version-dependent description of a VBA project. 
The first seven bytes of the stream are version-independent and therefore can be read by any version.
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
Reserved1 Version
Reserved2 Reserved3 PerformanceCache (va
...
Reserved1 (2 bytes): MUST be 0x61CC. MUST be ignored.
Version (2 bytes): An unsigned integer that specifies the version of VBA used to create the VBA project. MUST be ignored
on read. MUST be 0xFFFF on write.
Reserved2 (1 byte): MUST be 0x00. MUST be ignored.
Reserved3 (2 bytes): Undefined. MUST be ignored.
PerformanceCache (variable): An array of bytes that forms an implementation-specific and version-dependent
performance cache for the VBA project. The length of PerformanceCache MUST be seven bytes less than the size of
_VBA_PROJECT Stream (section 2.3.4.1). MUST be ignored on read. MUST NOT be present on write.
Source: https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-ovba/ef7087ac-3974-4452-aab2-7dba2214d239
https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-ovba/ef7087ac-3974-4452-aab2-7dba2214d239
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