I have a standard CC3 character opened in iClone 7 Pipeline. I do nothing except add the following motion:

\Template\iClone 7 Template\iClone Template\Motion\iMotion_Trey\Idle\Idle_02.iMotion

Now, if I right click the green bar for the animation in the "Motion" track at the bottom of iClone and select "Save clip" I can save another .iMotion file. Let's say I call it "Idle_02_Exported.iMotion." I assumed they'd basically be the same thing, but when I compare that file to the original, it is way bigger:

Idle_02.iMotion is 263 KB.
Idle_02_Exported.iMotion is 1,021 KB.

Why is the latter almost 4 times bigger? What new information is in there? Is it somehow adapting the original to the loaded character and storing extra information?

*** Edit: Sorry, I forgot to finish the post title and apparently can't edit it... It was supposed to be "Difference between original iMotion file and Saved Clip."