ManicMobile

What does the file extension QTX stand for?   I’ve searched the web and found out 2.
The first is that the file extension QTX stands for Quicktime Extension.  It is used by components of   Apple QuickTime Player.  It  enables support for additional video codecs and file formats. The second one is that the file extension QTX is a quicken data file.

What software do you need to use QTX?

Based on the above informations,  depending on the file, one needs apple quicktime, or quicken to open it up.

There might be some QTX related registry errors that people are searching for on the net.  You might need a good registry cleaner for this.