hello it seems that you have change the factory vst presets installation (talk about the factory c6 vst plugins)
all i see in my computer is a folder call “vst sound” in c6 folder with 5 “compact” files nammed “FCP_SMT_001_Cubase6.vstsound” & 002/003/004/005/
that mean we can not “touch” individual presets like in c5/c4 ?
bad news ! 
thanks for your answer
ps : i open one file with editor & see the new amp presets ! very very bad news !