InCopy CS3 Package File
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What is an INCP file?
INCP files are exported by a designer with InDesign, modified by an editor using InCopy, and then sent back to the designer as an .INDP package. The INDP file can be imported back into the original InDesign document (.INDD file) using InDesign.
NOTE: As of InDesign and InCopy CS4, InCopy package files use the .ICAP extension.