While reading the article googling up passwords I noticed one of the examples given was a google search for budget spreadsheets.

Here’s the syntax used to search google for Excel Spreadsheets:

search query filetype:xls

Simply append filetype:xls to the end of any google query and you’re returned .xls files.

Note: I’d personally inspect any code before “enabling macros”.

A few example queries for spreadsheets:
Budget
Gantt Chart
Solver