# Understanding .swc files

**URL:** <https://forum.kirupa.com/t/understanding-swc-files/306964>\
**Category:** flash\
**Created:** [March 25, 2010, 12:37pm UTC](https://forum.kirupa.com/t/understanding-swc-files/306964 "2010-03-25T12:37:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fs\_tigre](https://avatars.discourse-cdn.com/v4/letter/f/edb3f5/32.png) [@fs\_tigre](https://forum.kirupa.com/u/fs_tigre)\
**Post date:** [March 25, 2010, 12:37pm UTC](https://forum.kirupa.com/t/understanding-swc-files/306964/1 "2010-03-25T12:37:05Z")

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Hi,

I have been using Flash, Actionscript 3.0 (learning) and TweenLite but never heard about .swc files until today when I was reading a tutorial and the author mentioned about downloading the greensock.swc file which I have never heard before.

Can someone explain what a .swc file is, what it does? Because it looks like you can convert your .as files into a .swc files.

I Google it but I didn’t find a good definition (at least I didn’t understand it).

Thanks