qpdfviewer : "404 not found" the PDF file (absolute or relative URL)

[rrigaud]

Hi,
For several years, I was trying to use qpdfviewer extension, without success. I was thinking that it was very new, in alpha/beta.
But now, I'm trying again because I really need to display a PDF file inside my electron App.
Whatever I do, I'm not able to load a PDF in my App...
qpdfviewer is correctly installed, and I've tested some very simples cases :

• I put a test.pdf in every folder of my code, and try a src with 'test.pdf' or '/test.pdf' or './test.pdf' or '../test.pdf' : Fail.
  Failed to load resource : the server responded with a status of 404 (Not found)

• I put a button to select a PDF File to get the Absolute URL and load it : Fail again.
  GET http://localhost:8080/pdfjs/web/viewer.html?file=%2FUsers%2Fraph%2FDownloads%2Ftemp%2FTEMP%2Ftemp%2Ftest.pdf 404 (Not found)
  And the URL is OK because I can open my PDF file with a 'shell.openItem(pdfURL)'

Could someone help me please ?
Thanks a lot.