Q: How do I make PDF Studio my default PDF viewer application in such a way that PDF files always open with PDF Studio when double-click on them?
A: Depending on your operating system, follow the steps below to change the default file association to point to PDF Studio application for PDF files:

  1. Right-click on a PDF file.
  2. In the mouse menu, choose “Open With”.
  3. Choose “Choose default program…” in the sub-menu (last entry).
  4. A dialog opens.
  5. Select PDF Studio in the Recommended Programs list or Click “Browse” to navigate PDF Studio (C:\Program Files\PDFStudio\pdfstudio.exe) if PDF Studio is not showing in the list.
  6. Check the box “Always use the selected program to open this kind of file”
  7. Click OK to close the dialog.


  1. In Finder, select any PDF file.
  2. Go to “File” and “Get Info” in the Mac OS X menu bar.
  3. Expand the “Open With” section and you will see a drop-down list with the current default selected
  4. Click on the drop-down list and select PDF Studio.
  5. Click “Change All” and then “Continue”.


Linux (Ubuntu):

  1. Right-click on a PDF File.
  2. Select “Properties”.
  3. Go to the tab “Open With” and choose PDF Studio 2018.

If PDF Studio 8 does not show up in the list, open a Terminal window and follow the steps below.

  • cd ~/.local/share/applications
  • gedit  pdfstudio2018.desktop (this will open the file in gedit). Depending on the installer you used the file may be called pdfstudio2018-x.desktop with a version number.
  • Look for the line that starts with “Exec=” and add %f at the end of the line.For instance if the line reads:
    Exec=/bin/sh “/home/john/pdfstudio2018/pdfstudio2018”
    Change it to:
    Exec=/bin/sh “/home/john/pdfstudio2018/pdfstudio2018” %f
  • Save the file
  • After that, PDF Studio 2018 should show as an option under “Open With” in step 3) above.
  • As a root user, open “default.list” file under “/usr/share/applications”
  • Change “application/pdf=evince.desktop” to “application/pdf=pdfstudio2018.desktop”
  • Restart computer to apply changes.
If the above steps do not work, try the steps in this AskUbuntu answer.