so start off

{
4bits version
12 bits inst
}pointless;
= 2 bytes

fbt = 2 bytes
len = 4bytes

pointless = 2 bytes

fbt  = 2
if fbt = msofbtDgg f006
len = 4
4 butes for spidmax
4 butess for no of ids
4 bytes no of shapes (include delete)
4 no of shapes


{fidcl
}
=8bytes



