# How to unpack and then compress Doom 3 BFG data files?

**URL:** <https://discourse.ioquake.org/t/how-to-unpack-and-then-compress-doom-3-bfg-data-files/252>\
**Category:** Doom 3\
**Created:** [May 20, 2014, 8:24pm UTC](https://discourse.ioquake.org/t/how-to-unpack-and-then-compress-doom-3-bfg-data-files/252 "2014-05-20T20:24:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Radegast](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.ioquake.org/radegast/32/309_2.png) [@Radegast](https://discourse.ioquake.org/u/Radegast)\
**Post date:** [May 20, 2014, 8:24pm UTC](https://discourse.ioquake.org/t/how-to-unpack-and-then-compress-doom-3-bfg-data-files/252/1 "2014-05-20T20:24:34Z")

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Is there any documentation available about .resources and .crc file formats? The wiki link leading to info about [iD 4 tech file formats](http://wiki.iodoom3.org/Filetypes) is dead. It would be really helpful if someone could add a quick tutorial to the iodoom wiki about making a simple mod by packing .resources file.

Are the good old pk4 files still supported or was that functionality completely removed from BFG?