For best layout, table rows should be enclosed in a row or ruledrow command, since Tex2RTF can't cope with parsing the LATEX tabular syntax unaided. However, if you really don't want to go through LATEX files inserting new syntax, set the compatibility flag to TRUE in your tex2rtf.ini file. In this mode, Tex2RTF tries to make the best of a bad job, but the results won't be optimal (e.g., no table borders). Without this flag set, normal LATEX tables can crash RTF readers such as Word for Windows.