To open T:A .upk files you need a special extractor, however, I had a post where you could download it, but the MPGH Staff removed it. Here are the steps how to find, download and use the extractor, safe, and without viruses.
1) Go to this link: https://www.gildor.org/downloads (no advertisment is meant)
2)Download where it says "Unreal Package Extractor", first under the "Other tools" title. Don't download the "Unreal Package Decompressor"!(Doesn't work!)
3) The downloaded file should be called "extract.exe", I uploaded it.
4)To extract the chosen. upk file, just drag it to to extractor, and it will be unpacked into a named folder where the chosen .upk is located.
VirSCAN.org virus scan results show that extractor is safe to use and virus/malware free:https://r.virscan.org/report/0fdb1676...4e59453e*****ml
If you have any questions, please comment, and if You managed to download and use it successfuly, also comment to let me know did it work.
Last edited by Mercator; 05-30-2013 at 04:53 AM.