Nate wrote

Did you try Skeleton Viewer 3.7.94? If I remember correctly it can open 3.6 exports.

Yes, I tried it
Unfortunately, it did not work

Nate wrote

Is there a reason you need 3.6 specifically? You could run the latest 3.6 version of the editor, use Import Data to bring in your 3.6 data, save the project, then open the project with the latest, eg 3.8, and export 3.8 data.

Are you familiar with Java? The code for 3.6 is here:
spine-runtimes/spine-libgdx/spine-skeletonviewer at 3.6
If you really must use the 3.6 Skeleton Viewer I can make a JAR for you, but it would be better to use 3.8 if possible.

Yes, the reason is that the extracted files are in skel for 3.6 only
Yes Please
create the Skeleton Viewer 3.6 jar I really need it
Thanks a lot, I am waiting for you

Nate wrote

I have added a 3.6.53 Skeleton Viewer download link here:
Skeleton Viewer: Download

Thank you very much
Yes, all files worked now