TRY:
=VLOOKUP(C$1,INDIRECT("'[Moneyline and Sec spreadsheet.xls]"&A4&"'!$B:$F"),5,FALSE)
Note: This only works if all workbooks are open.
If the lookup book is closed, then you need to install the free Morefunc.xll addin from http://xcell05.free.fr/english/ and adjust formula to:
=VLOOKUP(C$1,INDIRECT.EXT("'[Moneyline and Sec spreadsheet.xls]"&A4&"'!$B:$F"),5,FALSE)
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