Good morning Dan,
Thanks for your answer.
Today I downloaded ToDoList 7.0.13 and I opened a TDL file, the test on links are working fine, If it's a PDF file the PDF Viewer program open and idem for PNG or HTML files, the association works fine,
I also tried to put a new link by drag and drop it's worked fine, it ask me kind of link I want, just click OK to confirm and it's OK
So my problem came with the 7.1.2.2