This down comes with 26 upper case letters. The letters are grouped together in one file so you'll need to know how to ungroup and select the letter(s) you need. All of the letters shown in the second image are included. These files should work with any cutting software or machine that can read one of those two formats (Silhouette Studio, Cricut Design Space, etc).
The file you download is a zipped file so you need to be able to unzip a file to be able to use these.