Notes about the T3X 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 T3X file type is primarily associated with 'TYPO3' by The TYPO3 Association. The TYPO3 project is a free CMS framework released under the GPL. The .T3X file is an extension of the framework.