This is a tap file to add support for LXQt Archiver to the thunar-archive-plugin in the Thunar File Manager, which adds archive operations to the file context menus.
Ensure that you have a .desktop file for LXQt Archiver installed in the $(datadir)/applications/ folder. This is usually either /usr/share/applications or /usr/local/share/applications.
Add the tap file to your $(libexecdir)/thunar-archive-plugin/ folder. This is most likely found in /usr/lib/xfce4/thunar-archive-plugin/.
Ensure that the .tap file is named identically to your .desktop file so that Thunar is able to confirm that the application is installed.
Note that the thunar-archive-plugin takes the applications from the desktop database, so after installing new archive managers in $prefix (i.e. /usr or /usr/local), make sure to run
update-desktop-database $prefix/share/applications
Most modern packagement systems will do this for you automatically, but if you are installing archive managers manually, you may need to run the above command first, otherwise you will get an error message telling you that no support archive managers were found on your system.