DTS/AC3 Source Filter is a compact and useful application which reads and passes DTS and AC3 frames to decoders from files.
In order to install this piece of software, 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.
If you are unable to install the filter, please read this small guide: How to install/uninstall DLL and AX codec files
Packed by Inmatrix, this filter is quite constantly updated and its last versions were added basic support for .dtshd / DTSHDHDR.