From version X4 (14) on, the CDR file is a ZIP-compressed directory of several files, among them XML files and the RIFF-structured riffdata.cdr with the familiar version signature in versions X4 (CDREvrsn) and X5 (CDRFvrsn), and a root.dat with CorelDraw X6, where the bytes 9 to 15 look slightly different -- "CDRGfver" in a file created with X6. "F" was the last valid hex digit, and the "fver" now indicates that the letter before no longer represents a hex digit.

Christopher Smith is president of American Graphics Institute in Boston, Massachusetts. He is the publisher and editor of the Digital Classroom book series, which have sold more than one million copies. At American Graphics Institute, he provides strategic technology consulting to marketing professionals, publishers and to large technology companies including Google, Apple, Microsoft, and HP. An expert on web analytics and digital marketing, he delivers Google Analytics training along with workshops on digital marketing topics. He is also the author of more than 10 books on electronic publishing tools and technologies, including the Adobe Creative Cloud for Dummies. Christopher did his undergraduate studies the at the University of Minnesota, and then worked for Quark, Inc. prior to joining American Graphics Institute where he has worked for 20 years. sequential numbering using publisher
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