Upgrading to ShockFiler Xtra 1.2.6

Movies authored with previous versions of ShockFiler Xtra should behave correctly with version 1.2.5, no changes are needed.

Modifying the movie Xtras list: If you plan to use the Xtra in Shockwave and have modified the xtrainfo.txt file to point to new Shockwave packages it is necessary to update your movies to trigger the download of the new packages. The procedure is detailed at this technote.