Once you start playing with "indirectly" referring to a outside workbook.. you will need to introduce the INDIRECT() function.. but the catch is that it only works if the other workbook is opened.
There is a free addin called Morefunc.xll that has a INDIRECT.EXT function that works with closed workbooks and it would be applied like this:
=INDEX(INDIRECT.EXT("'http://....../[ADV_Project_List_"&TEXT(A1,"dd-mm-yy")&".xls]Project Mapping Data'!$B$2:$B$128"),MATCH(K14,INDIRECT.EXT("'http://....../[ADV_Project_List_"&TEXT(A1,"dd-mm-yy")&".xls]Project Mapping Data'!$W$2:$W$128"),0))
Where you would enter the date in cell A1 of the active workbook that corresponds to the date in the file name to get.
Note: You may need to change the TEXT(A1,"dd-mm-yy") parts to TEXT(A1,"mm-dd-yy") depending on how you use dates.
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