Windows 10: Setting Microsoft Edge as the Zotero PDF viewer and using alternative as system viewer

I have the SumatraPDF viewer as my system default but for Zotero PDFs it's missing a highlight function, so I need an alternative custom viewer for Zotero.

I can't see any lightweight open source PDF viewer available for PC, so with reluctance, I want to use Microsoft Edge as the highlighting is OK.

However, I cannot work out how to point Zotero to Microsoft Edge as the custom PDF viewer. I found this info ( but it doesn't work for me.

Any advice appreciated (or suggestions for an alternative PDF viewer/annotator)
  • Here are settings for an alternative program, PDF-XChange Editor, and how to combine it with SumatraPDF. If you're working with annotations, you might be using ZotFile, which requires an additional setting for some functions to work.

    - Windows system default: SumatraPDF
    - Zotero custom viewer: PDF-XChange Editor
    - Zotero Add-Ons: ZotFile

    Zotero custom viewer settings:
    "Edit" -> "Preferences" -> "General" -> "Open PDFs using" -> "Custom..."
    - Path: C:\...\PDFXEdit.exe

    PDF-XChange Editor settings:
    "Preferences" -> "Launch Applications" -> "New..."
    - Name: SumatraPDF
    - Path: C:\...\SumatraPDF.exe
    - Parameters: -page %p "%1"
    -> Button in lower UI toolbar allows launching current file in SumatraPDF.

    ZotFile hidden preferences:
    Zotero: "Edit" -> "Preferences" -> "Advanced" -> "Config Editor"
    - search: extensions.zotfile.pdfExtraction.openPdfWin
    - change value from empty to: C:\...\PDFXEdit.exe
    -> Without this setting, zotero://open-pdf links (e.g. from extracted annotations) do not work properly. (ZotFile keeps using the system default (SumatraPDF), rather than the Zotero custom viewer.)

    There is also an alternative workflow for SumatraPDF as the system default in combination with an external PDF editor, without setting a custom viewer in Zotero. But this has the shortcoming that Zotero currently doesn't support SumatraPDF for opening a specific page in a PDF file, see here.
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