How may I delete old attachments from my attachment /photo file?

I did not realize that opening an attachment will automatically save it into a attachment file. Now I want to delete all my SAVED attachments and can't figure out how, so feed back would be greatly appreciated here.

I've tried a left click, but that doesn't work either. If I want to view the attachments, I HAVE to "download" them. Or is there another way? Will I have to install them on the computer in order to delete?

I want to delete a photo or a file from My Pictures or My attachements in Yahoo Mail. They are not in My Computer, but in my mail. They are not in compose, but they are already sent or recived mails?

I sent emails to a frind with attachments and saved the sent email, now I want to delete the sent emails and the atachments. HOW?

I have a lot of attachments in the Yahoo! email account that I use most frequently. It seems to slow down other functions. I created a different account so as to send all my attachments to that account and use it mostly for attachments. You can bet it...