<A HREF="/~tms/">The Mod Squad</A>, one of our premier modding affiliates, has released version 1.1 of their UnDAT utility, which you can of course use to extract information from Arcanum's DAT files. This version is twice as fast as Troika's UnDAT utility, according to the <A HREF="/~tms/">TMS site</A>.<br>And if that isn't enough, they also have documentation available on how the .DAT format works, in case you'd like to test your programming mettle against The Mod Squad to create your own DAT/unDAT utility! Some pretty good stuff if you're into Arcanum hacking & modding.
