While DTS 2000 is technically supported in SQL2008 its only available on the x86 (32bit) version.
See
http://msdn.microsoft.com/en-us/library/bb500440(v=sql.105).aspx
Especially
There is no 64-bit design-time or run-time support for DTS packages. On a 64-bit computer, DTS packages, and Integration Services packages that run DTS packages, can run only in 32-bit mode. For more information, see How to: Install Support for Data Transformation Services Packages
Are you running DTS on a 2008 box or just want to view the pacakges that are on a 2000 box, if its the latter then you ight be better installing a VM with SQL 2000 management tools and viewing them that way.
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SSC Guide to Posting and Best Practices