|Can't think of any program that would unknowingly create 32,000 png files. As Oracle said, move them all to one folder and give it a little while to make sure everything continues to run as normal (a month or two maybe?) Assuming everything goes fine, just delete the folder.|
This reminds me of the time I got a call from a client because every time he got on the internet his desktop would fill up with random files. He would delete them, then get on the internet again and the cycle would repeat. By the time I got over to his house he had a little under 40,000 files in his desktop folder. Turned out he had set his IE cache folder to his %username%\desktop.