You can open PDF files in PDFgear in various ways.

Open a PDF File
Method 1. If you have set PDFgear as your default PDF viewer, simply double-click the PDF file to open it.
Method 2. To browse and open a file in PDFgear, click the ‘Open File’ button located in the main interface.
Method 3. To open a PDF file using PDFgear, right-click the file and choose ‘Open with’, then select PDFgear from the options.
To quickly open the file, you can use the ‘Received File Reminder‘ button on the Settings page in PDFgear. Whenever a new PDF file arrives on your computer, PDFgear will show a reminder in the lower right corner of the screen.