The only tmd to doc conversion that would make sense is export of TextMaker documents (.tmd) and saving them in Microsoft Word document format (.doc). As far as we know, this can only be done using the original TextMaker because no 3rd party software seems to support TextMaker format.
Convert TextMaker document to Microsoft Word document (prior version 2007).
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert tmd to doc on Windows
A reliable word processor from SoftMaker Office suite
Convert from tmd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.