Everything is in the source code, isn't it? The protocols are implemented in code. The formats are implemented in code.
Open source - at least that released under the GPL and LGPL - pretty much guarantees open standards, doesn't it? Just how proprietary can a format or protocol be if the source code MUST be provided to any user who requests it?
Right now, Microsoft has the position in the PC software market that IBM had in the PC hardware market early on. When IBM introduced Micro-Channel Architecture and insisted on using it as a means of collecting back royalties, the clone makers refused to play along and IBM essentially lost the entire PC market. The fact that MCA was technically superior meant nothing. It was a licensing issue.
According to the various CIO surveys I read from time to time, Microsoft's Licensing 6 already has a large proportion of previously loyal Windows shops looking to implement something cheaper, possibly OpenOffice. A new and incompatible DOC file format, protected from reverse engineering by DMCA and only available to Windows users, may be all the encouragement they need. If so, the new "standard" document format could easily be the Star/OpenOffice "Writer" native format - SXW.