Originally Posted by ptom
is it possible to assign a relative path? I was wondering if it's in principle possible to change the path to sth. like "../pdf_portable/xyz.exe"
Here's a workaround for Windows OS (I'm doing this without problems): Go to YourCalibreConfigDir\Plugins\ > Open 'open_with.json' with a text editor > Change
"appPath": "C:\\Program Files\\xyz\\xyz.exe"
It's a little hassle but it worth the time if you're a portable geek (like me. Portable programs are best when you're working on multi Windows OS PCs. They also make it easier to upgrade hardwares and Windows versions.)