The suffix usually indicates that your computer or device has downloaded the same file multiple times. This typically happens if you click a download link twice or save a file to a folder that already contains a file named "17884.mp4." How to identify the video:

* #254,629 in Electronics (See Top 100 in Electronics) * #17,884 in Portable Audio & Video. Amazon.com Embedded Subtitles selected but not showing up

Right-click the file and select "Properties" (Windows) or "Get Info" (Mac) to see the "Origin" or "Date Created."