[This is preliminary documentation and subject to change.]
The MsiGetFeatureUsage returns the usage metrics for a product feature.
UINT MsiGetFeatureUsage(
  LPCTSTR szProduct,    // product code
  LPCTSTR szFeature,    // feature ID
  DWORD *pdwUseCount,   // returned use count
  WORD *pwDateUsed      // last date used
);
 | Bits | Contents | 
|---|---|
| 0-4 | Day of the month (1-31) | 
| 5-8 | Month (1 = January, 2 = February, and so on) | 
| 9-15 | Year offset from 1980 (add 1980 to get actual year) | 
  Windows NT: Requires version 4.0 or later. Available as a redistributable for Windows NT 4.0.
  Windows: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Windows CE: Unsupported.
  Header: Declared in msi.h.
  Import Library: Use msi.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT.