This is an excellent bit of EA to reverse-engineer.
The number which appears after the InforView=
is some kind of integer conversion of the binary choices in the Info View properties dialog,
with Icon = first bit, type = 2nd, stereotype=3, status=4 phase = 5, version =6, author = 7...etc taggedValue = 9
Hence the default is 7 = BIN 000111 which is icon, type and stereotype.
Some of the higher-order bits may be flipped, however, so the best way to set the default you want is to
set it in the UI, and inspect the database (in t_diagram.styleEX, as Geert said)
For example, I wanted my default to be tagged-values and stereotype, which is DEC 16645, 0b100000100000101,
which makes no sense....
EA also doesn't seem to care if you just append the 'make this element an Info View' onto the end of the StyleEx string, like:
OPTIONS_BF1367B4=InfoView=16645:;
...where the BF1367B4 is the DUID from t_diagramobjects.objectStyle.
Simple!