Convert DOC to DOCX

You can very easily convert Microsoft Word Documents to Microsoft Word Documents (version 2007 and later), as essentially all available word processors and converters support such efforts.

The simplest approach is certainly using Microsoft Word itself (version 2007 and later), as you can easily import your DOC file and re-save it in the newer DOCX format.

You will accomplish the same using any currently available word processing software and converter.