versioninfo ProductMajorVersion property
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Applies to
dcVersionInfo component.  

property ProductMajorVersion: LongInt; // Read only!  

The ProductMajorVersion property represents the left-most 32 bits of the product version number.  
ProductMajorVersion and ProductMinorVersion are used together to build a 64-bit file version number. The 64-bit value is represented in Microsoft's file version format.  

See also
ProductMinorVersion, FileMajorVersion, FileMinorVersion properties.