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To find out which version of Microsoft Active Accessibility (MSAA) is installed on your system, you should check the version of the Oleacc.dll file in the system32 folder on your hard disk. The following table maps the Microsoft Active Accessibility version to the Oleacc.dll version.
| Active Accessibility version | Oleacc.dll version |
|---|---|
| 1.0 | 4.01.0970.0 |
| 1.2 | 4.02.2900.0 |
| 1.3 | 4.02.3100.0 |
| 2.0 | 5.0.0.0 |
| 3.0 (Windows Automation API 3.0) | 7.0.x.y, where x is the build number and y is the (Quick Fix Engineering) QFE number |