Today I just realized that there are many sqmdata00.sqm files in my computer. So, I search through the internet and found out that this file was generated by Windows Live Messenger. The sqm files stand for "Service Quality Monitoring". This file will generate from feature "participate in the quality improvement program".

There was some bugs of Windows Live Messenger (8.1build 178) that it always generate *sqm file all the time even you disable this feature. So, I collect useful information for you from the internet.