The classic Tomb Raider games were designed for standard (4:3) aspect ratio monitors and TVs. This unofficial widescreen patch created by Ed Kurlyak (aka Mr.Blackfour) allows you to run Tomb Raider 2, 3 and 4, as well as the Golden Mask and Lost Artifact expansions, on widescreen monitors without the usual distortion. It works with the CD installations, as well as the GOG and Steam games.
The advanced version also includes options for adjusting the field of view and the distance between the camera and Lara, in case you find Lara appears too close after installing the widescreen patch.
Follow these links for more info and patch file downloads:
TRJTA has recreated the original TR loading screens for widescreen monitors. For downloads and instructions, visit this post on tombraiderforums.com.