you should file a bug and attach a sample doc, please remove all private/confidential information before or better create a new doc, if that can be done easily (don't know how complex your docs are). Does this only happen with Russian Word and/or docs in Russian?
When I open the sample file in 1.5.14, Word pops up an error message about MetaConv.txt, but does open the file, and after I click through the error dialog, seems to work okay.
Dark Smoke: before filing a bug, test in 1.5.14 from a clean wineprefix. You should have no overrides other than riched20.