I'll bet 27 cents, my mother's gravy ladle and a copy of John Jacob Niles that there was no infected file in a Eudora download. (Since you got it froma Google link, I assume it was from Eudora.com...made by Qualcomm)..You don't say what told you it was infected, or what it was supposedly with.I can't imagine why a virus would be put in a Windows temp file anyway...and Eud3 is a strange name for a file with a problem.....
You also don't say whether Eudora was installed correctly and whether you tried to run it, or whether you deleted that file, etc....
whatever the problem is, it is not likely to be from a download from a major company.