.ncb是什么东东？

Searching for 'OQAwafer'...
Cannot open file 'D:\DREAMS\src\cxx\dreams.ncb'.
D:\DREAMS\src\cxx\dblib\triggerlib.c(632):/* For OQAWAFER TABLE */
D:\DREAMS\src\cxx\dblib\triggerlib.c(634): sprintf(SqlStmt, "DELETE FROM OQAWAFER WHERE ORGLOTID IN (SELECT LOTID FROM OQALOTINFO "
上面是我在VC中搜索OQAwafer时
在Find in File 1的信息请问:Cannot open file 'D:\DREAMS\src\cxx\dreams.ncb'.中的.ncb是什么东东？