Programs like LibreOffice Draw or similar can open diagrams created in Microsoft Visio and also have the option to export files to BMP so it is probably best and cheapest choice how to convert VSD to BMP.
Convert Microsoft Visio diagram document to Standard Windows bitmap image.
We have found 2 software records in our database eligible for .vsd to .bmp file format conversion.
Microsoft Windows software - convert vsd to bmp on Windows
Visual processor used to create high quality presentations, charts and graphs
Convert from vsd file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned vsd to bmp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert vsd to bmp on any platform
Graphic and diagram software from LibreOffice suite