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:\..
You can, there is a software to do just that, to Run Windows applications on Linux, BSD, Solaris and Mac OS X. Just open Ubuntu software center and search for Wine and install that. However, not all the .exe programs can run smoothly on Ubuntu, give it a try and hope.