There is only one file type that uses the .PDFIG extension:
PDF Index Generator Project File
Project file saved by PDF Index Generator, a program used to create book indexes for .PDF files; contains all generated index data, as well as the project settings for the index, such as the input filename, pages numbers to index, and words to include or exclude; saved in an XML format.
PDFIG project files can be used to automatically append an index to an existing PDF file. They can be reopened and edited to create new indexes.
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Updated: July 8, 2010