I don't have a vusrdata.e, but the vunxdata.e has the following line:
replace_def_data("def-language-c",'MN=C/C++,TABS=++2,MA=1 74 1,KEYTAB=c-keys,WW=1,IWT=0,ST=8,IN=2,LN=cpp,CF=1,LNL=1,TL=-1,BNDS=0 0,CAPS=0,SW=0,SOW=1,HX=0,LNF=3,ALM=0,FWRM=0');
-Tim