At the moment, I have a spreadsheet that is an index to filed documents, with
a primary key of a number in column A. All the files are stored with the
number of the file as the filename. Eg G:\Research &
Resources\DATABASE\F23.pdf. Assuming my data is in cell A1, If I use the
formula =HYPERLINK(CONCATENATE("G:\Research &
Resources\DATABASE\F",A1,".pdf")), then it works well.

That's fine if they're all pdf documents, but there are excel spreadsheets,
and jpeg files, word documents and even folders. Is there a way that I can
get it to launch any or all things starting with what's what's in A1? I
tried =HYPERLINK(CONCATENATE("G:\Research & Resources\DATABASE\F",A1,".???"))
but it doesn't work. Does this mean that I can't use wildcards in formulas?
Is there any other way around this problem so that it will launch any file in
the correct folder starteing with the number in A1? Any help would be much
appreciated.