This program is mandated by Section 5 of the Toxics Substances Control Act (TSCA). The New Chemicals Program functions as a gatekeeper which can identify conditions-up to and including a ban on production-to be placed on the use of a new chemical before it is entered into commerce.
Currently, the newest version is MS Word 2010. Same with all the other different MS applications (PowerPoint, Excel, etc.)
Most people have an earlier version of Word, and will be unable to access or read a Word 2007 document unless it is saved as a file with earlier Word document format (which is .doc ; for Word 2007, Microsoft created a new file type, .docx ).