Though a majority of the files we open, read and write when we use a computer have the standard file extensions like .txt for text files, .doc for Microsoft Word documents, and .xls for Microsoft Excel documents, some times we encounter a strange file with an unusual file extension like 9xk, which cannot be opened.
The file extension is defined by the software and enables it to recognize the file format in which data is stored in the file. By default, the software installed on our computer can recognize the commonly used file formats, and if a particular file format is not recognized, the user is asked to search and download the relevant software from the internet.
However, if the particular file format is not used regularly, installing software to read the file format may take up a lot of memory on the computer and slow it down. Installing the software on a computer may result in registry changes, as a result of which some older files cannot be read. By using a free registry scanner, these changes in the registry can be detected and undone if required, so that all files can be opened.