What is the "imgcount.txt" file in every one of my My Pictures subfolders in Windows 7 64-bit Prof? Why? Delete?

What is the "imgcount.txt" file in every one of my My Pictures subfolders in Windows 7 64-bit Prof? Why? Delete?

I have almost 280 different imgcount.txt files, one in each subfolder of My Pictures folder in Windows 7. Each with just a number of how many files are in each folder.