What is a "zip" attachment?

Here's what the failure notice says: "This message has been rejected because it has a potentially executable attachment "client.probate.mcmahon.fam.let.lnk" This form of attachment has been used by recent viruses or other malware. If you...

When ever i add a picture from my computer to the mail compose window it prompts to add as a attachment or a zip file.I would like to learn to add the picture on the main window rather than a attachment or zip.

I posted my resume on criagslist looking for a job. I received a response stating to open attachment for more information regarding job description and enter in the password given when prompted. The attachment was a zip file and came up to password but...

I have been sending individual photographs. I would like to put them into a folder, zip them and send as an attachment. I do not know how to zip. Is there a limit on the amount of data to be contained in the folder?

When I try to open attachment on a 'scam' email, it goes through the 'scan for virus', says 'no virus found', but nothing happens when I try to open (download) it. Why??

i got them like spam and also it req me to open the zip file to activate my yahoo account

Ok so my assignments are for a computer math class, where we use sketchpad and the files are emailed and submitted as a .gsp file. The professor then grades it and emails it back and asks us to fix it and resubmit it. I am receiving it in a zip file...

some attachments i can open some i can't. the one i can't open says application/x-zip-compressed is there a free download? also why is this so complicated to open attachments?