AC97 Sample Driver and Related Code Samples. This directory contains a sample AC97 adapter driver and several related code samples. These samples need to be compiled with the Windows .NET or Windows XP build environment but are binary compatible with older operating systems like Windows 2000. To build the samples, enter any Windows .NET or Windows XP build environment and run build –cZ from this directory. The AC97 sample driver also runs in Windows 98 Second Edition or Windows Me, but the property page DLL and control panel application do not. For more information, please refer to the readme.htm files in each subdirectory. The INF file in the driver directory installs all of the samples in the subdirectories. The header file in this directory defines the private property used by each of the samples.