Make Fluah your default PDF app
Fluah never takes over your PDFs. You choose it in Windows.
Where to find it
Windows SettingsAppsDefault apps
Steps
For one PDF: right-click it in File Explorer › Open with. Fluah is in the list.
For every PDF: Windows Settings › Apps › Default apps, then pick Fluah for .pdf.
Fluah's setup puts it in both lists, but never makes itself the default.
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Updated 6 November 2026