Adobe ACROBAT 3D Manual page 600

Moving document collections and their indexes
You can develop and test an indexed document collection on a local hard drive and then
move the finished document collection to a network server or disk. An index definition
contains relative paths between the index definition file (PDX) and the folders containing
the indexed documents. If these relative paths are unchanged, you don't have to rebuild the
index after moving the indexed document collection. If the PDX file and the folders
containing the indexed documents are in the same folder, you can maintain the relative
path simply by moving that folder.
If the relative path changes, you must create a new index after you move the indexed
document collection. However, you can still use the original PDX file. To use the original
PDX file, first move the indexed documents. Then copy the PDX file to the folder where
you want to create the new index, and edit the include and exclude lists of directories and
subdirectories, as necessary. (See Creating a search index.)
If the index resides on a drive or server volume separate from any part of the collection it
applies to, moving either the collection or the index breaks the index. If you intend to
move a document collection either to another network location or onto a CD, create and
build the index in the same location as the collection.