Index Match to data in other workbook

Good Day!

I searched the internet but can't find the right way to get it to work. Don't know where to put the : [] \ .....
I want an index match which retrieves data that is located in another workbook (which is not open/active, no idea if this important).

=INDEX(X:\Data\Metro Communication\01 - AUTOMATIC ORDERING METRO\03 - AANVRAAG - DEMANDE\STOCKMODEL voor templates.xlsb:[21]$H$1:$Y$70000;MATCH(B8;X:\Data\Metro Communication\01 - AUTOMATIC ORDERING METRO\03 - AANVRAAG - DEMANDE:[STOCKMODEL voor templates.xlsb]21'!$H$1:$H$70000);MATCH($C$7;X:\Data\Metro Communication\01 - AUTOMATIC ORDERING METRO\03 - AANVRAAG - DEMANDE:[STOCKMODEL voor templates.xlsb]21'!$H$1:$Y$1))

Path = X:\Data\Metro Communication\01 - AUTOMATIC ORDERING METRO\03 - AANVRAAG - DEMANDE
File = STOCKMODEL voor templates.xlsb
Sheet= 21