I am having a bit of the same trouble, but I did find a little bit of info on what some of the Numbers Mean for FoxPro, I am not sure if this is similar to the values ESRI uses to determine languages or not. The value in my dbf files at byte 29 is 0x57h, and I do not see that one on the list so I am assuming that the list is not up to date. But here is the link anyway.
Also, I see it has been a while since you posted this and I was wondering if you learned anything else. If so could you please let me know, because at this point I am still looking.