.qct file: how to open it on Windows

2 Windows apps register the .qct extension. Install one of them to open the file with a double-click.

• 
  GPXSee

  GPXSee is a Qt-based GPS log file viewer and analyzer that supports all common GPS log file formats.

  Open source 16.18 ★ 1.3K
• Q
  QuarkXPress CopyDesk 2025

  Content collaboration software for copy and image editing in QuarkXPress layouts.

  Proprietary 21.1.2.0

Related guide: Change the default app for a file type in Windows