Publisher comment to "Steven White 59":
Steve, sorry to hear about your troubles unzipping the file. Winrar and Winzip are the commonly used programs to open and extract our products. If you have any further questions or concerns there don't hesitate to get in touch with our customer service at: custserv@worldworksgames.com
In terms of your quality concerns, I would only point out that this particular terrain set is over 6 years old and we've certainly come a long way since then. That said, the terrain still offers incredible content and value.
If you have any further hesitations about our products and or their "consumer built" appearance I would encourage you to visit our customer build gallery here: http://wormholegamer.com/photos/index.php?cat=1 AND to visit our community forum to speak directly with other builders: http://www.worldworksgames.com/forum/
Thank you for your support!
-Denny