This worked for me. Changed it a bit to support your situation. Simple code, no need for array's and stuff.

Assuming that you don’t have systems running old and new installs (if that's at all possible).

code:
;Check if file exist on system.
$LocationA = Exist("c:\Lotus\Notes\Data\bookmark.nsf")
$LocationB = Exist("C:\Program Files\Notes\Data\bookmark.nsf")
;Check if old, new or no install.
Select
	Case $LocationA = 0 AND $LocationB = 0
		MessageBox("File Bookmark.nsf not found on system.","File search...",64)
	Case $LocationA = 1
		MessageBox("File Bookmark.nsf found in c:\Lotus\Notes\Data\ (old install).","File check...",64)
	Case $LocationB = 1
		MessageBox("File Bookmark.nsf found in C:\Program Files\Notes\Data\ (new install).","File check...",64)		
EndSelect
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