As the word says, the Key are associated with a file. Its key has errors or faulty Entries; it will slow down your computer or make it impossible to open documents by double-clicking them. File associations allow you to double-click on a file of a know extension such as a PDF file, word document, graphic file, etc. and have the program that is associated with that file type automatically load the file. If the path that points back to the application that loads a specific file type extension is missing, then the file association will not work, and may cause your system to hang or become slow or unresponsive. WinMaximizer detects errors in file association areas of the registry and will remove the bad associations from the registry.