How to open a saved platformio project?

PlatformIO IDE
1

Hello,
I have saved a project, including .ini file. But I can’t open it back. Even if I locate the file with atom, I get an error:

Screenshot
Screenshot928×283 37.6 KB

Thank you

2

What are the files within that target project folder?

3

The one generated by platformio:

~/PlatformIO/Projects
$ ls -R
.:
Spectro

./Spectro:
include  lib  platformio.ini  src  test

./Spectro/include:
README

./Spectro/lib:
README

./Spectro/src:
main.cpp

./Spectro/test:
README