Q:
It’s easy to set a default PDF viewer on Windows. But how can I set CosEdit (http://www.pdftron.com/pdfcosedit/index.html) as my default PDF editor, so that when I right-click on a PDF and select edit, the PDF is opened in CosEdit?
A:
Edit the registry (assuming that your CosEdit path is “D:\Program Files (x86)\PDFTron\CosEdit\CosEdit.exe”):
HKEY_CLASSES_ROOT\SystemFileAssociations.pdf\shell\edit\command
(default) REG_SZ “D:\Program Files (x86)\PDFTron\CosEdit\CosEdit.exe” %1
Now you when you right-click on a PDF, you should see “edit” in the context menu, and it should bring up CosEdit.