Also the building process creates the folder:
Content\bin\DesktopGL\Content\ whith all the xnb files in it.This folder
is not created, when I use the Pipeline tool.
The pipeline tool imports the files to the application current directory.
When you build the project it takes those files and creates the xnb files in the bin / ect. directory.
That is current directory that the xnb files are located at when the application runs.
Point is Myimage.png in my content folder has a matching Xnb in a nested bin folder.
These two paths are Not the same.
Jenkins complains about not finding .xnb files
Print out the (full-file-path) name of a thing you are trying to load or save when ever you get a message saying that a file can’t be found.