After trying many different things, this is the registry edit that finally got SoundForge 10 working for me with X1/64 and windows 7.
Name Type Data
ExePath REG_SZ C:\Program Files (x86)\Sony\Sound Forge Pro 10.0\Forge100.exe
MenuText REG_SZ Sound Forge &10
StatusBarText REG_SZ Run Sound Forge 10 Audio Editor
Type REG_SZ WaveEditor