LO Writer is free.
There was a docx upgrade for Word2002/XP. If you have an older Word consider LibreOffice. Older versions are available if the PC can't run 6.x family. I have 6.2 on Win7 and 5.3 approx on XP and 6.4.7.2 on Linux Mint.
Best to edit / save in native ODT format, but it can import and export .doc and .docx etc.
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