Affinity Chooser

Affinity Chooser is a fairly simple application that accomplishes a somewhat unconventional purpose: that of running a program (or a set of programs, for that matter) in single core mode on a multi-core processor.
It can come in handy when you want to run an old application that supports only single core architectures, therefore it cannot be launched on a more advanced CPU. The task is hardly achievable by hand, therefore a program such as Affinity Chooser can be a huge time and effort saver.
It does not need installation, but however, it does not fit the definition of a portable application, because it creates an entry inside the Users folder. As far as the appearance is concerned, Affinity Chooser adopts an incredibly simple approach, with just a few buttons placed inside a tiny interface.
All that needs to be done is to select the path of the application you want to run on single core and add it to the list. It is possible to add more than one program, however, options to delete these from the list are not available at this time.
In order to remove the entries, you are required to navigate to your Users folder and find the applist.txt file, open it and erase the records manually. This comes as a major downside especially that you also have to restart the application in order for the changes to become visible.
To sum everything up, Affinity Chooser carries out a complex task, despite its raw simplicity. It can be maneuvered by beginners as well, on account of its ease of use.