Warning : the symbol does not mean that these are necessarily new publications but only that they are publications newly included in this bibliography.
The Philosophy of The X-Files, by Dean A. Kowalski, Paperback: 314 pages Publisher: University Press of Kentucky; New edition (February 26, 2009) Amazon
Wanting to Believe: A Critical Guide to The X-Files, Millennium and The Lone Gunmen, by Robert Shearman, Paperback: 304 pages Publisher: Mad Norwegian Press (August 10, 2009) Amazon
The Complete X-Files: Behind the Series, the Myths, and the Movies [SPECIAL EDITION], by J.J. Abrams et al, Hardcover: 208 pages Publisher: Insight Editions; Limited edition (June 16, 2009) Amazon
X-Files Book of the Unexplained: Volumes 1 and 2, by Jane Goldman, Paperback: 688 pages Publisher: Harper Paperbacks (July 1, 2008) Amazon
Antibodies (X-files No 5), by Kevin Anderson, hardcover, November 1999 Amazon
Bad Sign : A Novelization, (X-Files No. 3) by Easton Royce Amazon
Control : A Novelization, (X-Files , No 7) by Everett Owens, Chris Carter (Creator)Amazon
E.B.E. : A Novel, (X-Files, No. 9) by Les Martin, Easton Royce Amazon
Empathy : A Novelization, (X-Files , No 5) by Ellen Steiber Amazon
Fear : A Novel, (The X-Files , No 7) by Les Martin Amazon
The Truth Is Out There : The Official Guide to the X-Files, (The Official Guide to the X-Files, V. 1), by Brian Lowry, Chris Carter (Creator), paperback, December 1995 Amazon
Trust no-one : the official third season guide to the X-files, (the Official guide to the X-files, v.2) by Brian Lowry et al, Amazon
The unauthorized x-cyclopedia : the definitve reference guide to the X-files, by James Hatfield et al, Amazon
The unauthorized x-files challenge: everything you ever wanted to know about TV's most incredible show, by James Hatfield et al,
Amazon
Voltage : A Novel, (X-Files, No. 8) by Easton Royce Amazon
X Marks the Spot, (X-Files, No 1) by Les Martin Amazon
The X-Files Boxed Set - V. 6 (Wetwired, Talitha Cumi, Pusher, Jose Chung's "From Outer Space", Piper Maru, and Apocrypha) , NTSC Video (1996) Amazon
The X-Files Boxed Set (The Blessing Way, Paper Clip, Clyde Bruckman's Final Repose, War of The Coprophages, Nisei, 731), NTSC Video (1995) Amazon
The X-files : fight the future, by Christ Carter, paperback, Amazon
The X-files : fight the future scrapbook, by Caitlin Blasell and Christ Carter, paperback, Amazon
The X-files : Goblins, by Charles Grant, paperback, Amazon
The X-files No 6, by Kevin Anderson, paperback, December 1999
Amazon
The X-files : Whirlwind, by Charles Grant, paperback, Amazon
The X-files postcard book : the conspiracies, by Chris Carter, paperback, Amazon
The X-files X-posed, by Michael Joseph and David Richter, paperback, Amazon
Wanting to Believe: A Critical Guide to The X-Files, Millennium and The Lone Gunmen, by Robert Shearman, Paperback: 304 pages Publisher: Mad Norwegian Press (August 10, 2009) Amazon
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Warning : the 
symbol does not mean that these are necessarily new publications but only that they are publications newly included in this bibliography.
X-files : the complete second season, DVD