Information on Microsoft's Software Quality Metrics (.sqm) file format?

Question

i'm using Microsoft's SqmApi.dll library to add telemetry to an application. e.g.:

ISQM sqm = new Sqm("ContosoGrobber");

sqm.Increment(FileOpen, 1);
sqm.SetIfMax(QueryTime, stopWatch.Interval);
...

sqm.CloseSession(System.IO.Path.GetTempPath());

And now i have a .sqm file ready for me to WebRequest back to my web-server:

Now all i need is a way to crack open the guts inside the file:

ContosoGrobber00.sqm:

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MSQMx       šwD                                      
€Ÿ¨¡•æÌp¿Ÿ¤•æ̈ºX¦Ô|NÕï'CðÆÏ                                            
g  

Has anyone figured out the undocumented internal format used by every Microsoft product created in the last 8 years?

It's obviously not Base64 encoded, so presumably compressed.

Bonus Reading

• The Microsoft Customer Experience Improvement Program
• Microsoft Open Specifications - Corporate Customer Experience Improvement Program Client-to-Server Protocol Specification
• Channel 9 interview about Software Quality Metrics (SQM) with Partha Sundaram

Bonus Chatter

The Microsoft Customer Experience Improvement Program–Part 2

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for privacy reasons Microsoft doesn’t share any details in public about the SQM file format. The SQM file basically contains header data and Datapoints.

Answer 1

Perhaps it's some kind of MS standard serialization of the wire protocol? The MS-SQMCS client-server protocol doc notes that the header begins with 0x4D51534D (hex for MSQM).