FastCAD engineering software supports export to common DXF/DWG format and so your obvious choice for fcd to dwg conversion would be us this software. We have no information about any other program that support .fcd CAD files, so the original software probably remains the only choice for this type of fcd to dwg conversion.
Convert FastCAD or EasyCAD 2D vector image file to AutoCAD drawing.
We found one software available in the database for this conversion.
Microsoft Windows software - convert fcd to dwg on Windows
A high-precision professional 2d/3d CAD System
Convert from fcd 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.