If your computer already contains a lot of files, you would have difficulty finding a file in folders.
Here is how to find the files in a folders :
Open Windows Explorer and then in the search box (the search box located on the right side of the address bar) type *. Extension, for example: "* .exe" Then press enter.
Another example: If you will search for BMP image file, click the folder / drive that contains an image and then type "* .bmp" and then press enter.
All BMP files will appear.