's developer), this filter is quite constantly updated and its last versions were added support for DTS Express and DTS-HD (.dtshd) / DTS-HD HR.
In order to install this filter, extract the files from the archive and open the Release/Release Unicode/x86/x64 folder (depending on your operating system).
Next copy DLL or AX files in the system32 folder from C:\Windows\System32. Access Run from the Start Menu and type regsvr32 filename.dll or regsvr32 filename.ax.
If you want to uninstall the application you have to type regsvr32 -u filename.dll or regsvr32 -u filename.ax in the Run window. You will receive a message saying that your file was installed or uninstalled.
See also this small guide: How to install/uninstall DLL and AX codec files
- DTS/AC3 Source Filter - Black Edition has an installer.