Notes about the XQL file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The XQL file type is primarily associated with 'XML Query Language (XQL)' by World Wide Web Consortium. The XML Query Language (XQL) is a notation for addressing and filtering the elements and text of XML documents. XQL is a natural extension to the XSL pattern syntax.