Hi Michael,

The error comes not from clicking the PDF, it comes from inside Mixcraft (help menu). The file associated with the PDF is Edge and as expected, the Edge browser opens the PDF properly:




The problem occurs when I click the Help menu inside Mixcraft, then MOI is started :



I really don't know why this is happening, but MOI-5 seems to have changed a setting in the registry (which then is stuck there even after uninstall of MOI). Hm, I will try browsing the registry to see if I can find any reference to MOI in the wrong place....