File Maintenance under DBFCDX
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     When an existing tag in a compound index (.cdx) is rebuilt using INDEX
     ON...TAG... the space used by the original tag is not automatically
     reclaimed.  Instead, the new tag is added to the end of the file,
     increasing file size.

     You can use the REINDEX command to "pack" the index file.  REINDEX
     rebuilds each tag, eliminating any unused space in the file.

     If you rebuild your indexes on a regular basis, you should either delete
     your (.cdx) files before rebuilding the tags or use the REINDEX command
     to rebuild them instead.