When you say Filemaker II, do you mean Filemaker ver 2, there was some confusion available
This wikipedia page lists the versions
If it is truly Filemaker II, I am unsure as to the upgrade path.
If it is Filemaker ver2, the demo of Filemaker ver6 can convert it.
This Filemaker ver6 demo is still available with a Google search
Once it is in ver3 to ver6 (fp4), version 7 to 10 (fp7) can convert it.
The differences are so sky-high. I would rebuild the database. As for the conversion of the data I would rely on a tab separated export/import procedure.
Sadly I am converting from FILEMAKER II -- I'll keep looking into it.
You're best bet is probably to export from Filemaker II to a text file such as tab or csv. Then you can import your data into a new table in filemaker 10.