Some 3D modeling tools support (sometimes with plugins) special formats from various game engines, for example the famous ID Tech engine for Doom. So it should be feasible to import .md5mesh files (Doom 3) to Blender or 3ds Max and work with or alter these graphics files.
Convert Doom 3 ID Tech 4 game engine 3D mesh file to 3ds Max (3D Studio MAX) graphics.
We found 3 software records in the database related to .md5mesh to .3ds file format conversion.
Microsoft Windows software - convert md5mesh to 3ds on Windows
A widely-used 3D animation application from Autodesk
Convert from md5mesh 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 md5mesh to 3ds. 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.
A very popular free program used for work with 3D graphics
On-line services software - convert md5mesh to 3ds on web
A free online 3D model conversion service