Should you need it, you can still work with old Sonic Foundry projects (.veg) in later Sony Vegas professional broad tool and even export to any of the available multimedia formats, for example .aaf files (Advanced Authoring Format).
Convert Sonic Foundry Vegas video project to Advanced Authoring Format.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert veg to aaf on Windows
A set of professional tools for broadcast production by Sony
Convert from veg 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.