File List ... and how to get 'em

Every once in a while I count the number of webpages I've written, the number of pictures, the number of ...

>Yeah, so?
Well, there are thousands of files on my website (of various flavours) and ...

>And you count them, right?
Well, not exactly. I use a simple spreadsheet which looks like so:

You type in the name of the directory (or folder), and something which identifies the file type, then click a button.

>And I click on the picture to get the spreadsheet, right?
You got it !  

>Why would I want to know how many htm files I have?
But you can look in any folder for any file types, like maybe:

Well, it works okay for Windows ...