CheckSerial.exe

CheckSerial.exe is a utility provided by BRC which will allow you to check the license information contained within a brserial.dat file.

To enable this functionality via a double click in windows explorer, create a batch file (named CheckSerial.cmd) in the same directory as CheckSerial.exe containing the following:

@echo off
%~dp0\CheckSerial.exe %~s1
pause

Then double click a .dat file and choose to open it with your batch file.