@admin Not quite sure where to post this as this is simply a general question that popped up during a download. I downloaded an image of Windows 7 and with it came 3 files with the same name as the image but with MD5, SHA and SFV extensions. What are they? Are they simply a byproduct of the download and can be safely deleted? Or are they files that contain the verification code? The codes themselves were shown at the download site so I was able to verify them, so I really don't understand the purpose of these files... and I have no clue how to open them to see if there is any content. Please note, I am familiar with both the purpose of hash values and the means of verifying them... I don't need any clarification there. I am simply confused about the purpose of these files with these extensions, and how to use them. And while I'm asking weird (and possibly stupid) questions that I don't know where to post.. is there any real difference between an .iso extension and a .iso Archive extension? I have a win 7 pro download with .iso, and a win 7 ultimate with a .iso Archive extension. I successfully burned both, but have not used the latter yet. Thanks for any clarification! I've spent the last hour fruitlessly searching for more info on these two items and am somewhat surprised that there isn't any info on it. Perhaps the answers are really obvious to everyone else in the world. But please... can someone just humour me?