I have multiple accounts, and multiple devices sharing applications. To follow up the other responses, your App Store account can be separate from your iCloud, Messages, and FaceTime accounts. I use a separate account (Apple ID) for iTunes purchases than my iCloud account.
Running .EXE Files With WineHQ. From your Ubuntu command line type $ wine application.exe where application is replaced by the name of your .EXE file. This method will only work if your file is located in a path location. WineHQ gives these examples: Path=c:\windows;c:\windows\system;e:\;e:\test;f:\..
Ubuntu Documentation. ClamAV. ClamAV can only detect viruses and move any infected files into a quarantined folder; it cannot remove them from files. ClamAv detects viruses on all platforms, but it is primarily useful for Windows viruses and malware. Other antivirus programs running on Ubuntu can be found here.