1. Install ASV6 in Netscape/Firefox (just run installer, if necessary copy the files NPSVG6.dll and NPSVG.6.zip from "Program Files\Common Files\Adobe\SVG Viewer 6.0" to "Program Files\Firefox\plugins"

2. Run regedit and copy the 2 keys in "HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe SVG Viewer\6.0" to a backup spot (eg
"HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\6.0 backup"). 

3. Run the ASV 3.x installer from IE6. 

4. Cause the registry key for 6.0 has now been replaced by the one for 3.0(HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe SVG Viewer\3.0):
Create a new registry key directory "HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe SVG Viewer\6.0" en copy the 2 keys from backup to it. (only possible by manually creating new keys and copying the content?).