Question: how to convert blg to csv?
Answer: Open a command prompt (Start–>Run–>Type cmd–>Enter) or from Tiles just type cmd and press enter.
Use “cd” to change directory to the directory containing your .blg file.
Now type. relog NameOfYourFile.blg -f CSV -o NewNameOfFile.csv. ... 
Open Excel and import the new . ... 
Now you can work with the log file data in excel.