Text editor for ubuntu 16.04

This is software from outside Ubuntu. I suggest that you look for information on that source, e.g. the support pages https://software.intel.com/en-us/forums/intel-xdk

And generally, files with an extension .tgz usually are zipped archives that usually can be unpacked with the tar utility.

A suitable command might be something like
tar -xzf filename_of_the_archive

see the man pages for tar for additional or other flags that you might have to use.

Hello. I sometimes open *.tar.gz archives just by clicking on it. They are opened with File Roller: an archive manager for the GNOME environment. Of course there is an option to unzip such archive via menu etc. Maybe try to install this application e.g. via APT-GET(8) utility? Package name:

[~]$ apt-cache search file-roller
file-roller - archive manager for GNOME
thunar-archive-plugin - Archive plugin for Thunar file manager

I hope, that it will help You somehow.

Best regards.

By the way; File Roller is a very light and fast application. After clicking on archive I can browse directories, open files etc. and then - if I want - I can unzip such archive.

Hello,

Thank you for your reply,

But I am not an expert at doing this. Can you give me more of exact commands to make this work?

I would appreciate it.

Thank you,

Are you really sure that you want to install Intel XDK if you search for a text editor?
Intel XDK is a development platform for mobile apps, see https://en.wikipedia.org/wiki/Intel_XDK

And as already written in my very first comment, you can use tar to unpack the tgz file.
Or - if you want to use GUI tools - what happens if you doubleclick on the tgz file in the file explorer?

Hello,

Never mind. I guess I don't need it.
I was following a tutorial for building a website and they used this program.

Thanks anyway