有關OPENROWSET,如何識別用tab分開的txt文件,並分出各個字段

Question

po.txt有三個字段,用tab分開,格式為:
D0102294             1980-06-13 TLC                                       
D980485              1998-09-22 MCC                                       
D980486              1998-09-22 MCC                                       
D980487              1998-09-22 MCC                                       
D980488              1998-09-22 PCM   select  * from OPENROWSET(MICROSOFT.JET.OLEDB.4.0','Text;HDR=NO;DATABASE=c:\aa\','select * from [po#txt]')不能分出三個字段,而變為一個字段,如果用","就可以,
如何識別用tab分開的txt文件,並分出各個字段