Where Does FastStone Store Settings?
FastStone files settings in FSViewer.ini plus thumbnail databases in AppData, with a portable switch available.
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FastStone splits settings from bulk data. FSViewer.ini holds every option in readable form while thumbnail databases cache folder views for speed.
A portable mode relocates both into the program folder for drive friendly operation. The thumbnail database location itself is configurable for full drive users. Database files can grow large on photo libraries, worth knowing before SSD panic.
Where FastStone Image Viewer stores this, by platform
%APPDATA%\FastStone\FSViewer.ini
FSViewer.ini plus thumbnail databases live here. Portable builds keep the same files beside the exe instead.
Frequently asked questions
How do I migrate settings?
Copy FSViewer.ini and the thumbnail databases with the app closed. Installed builds read AppData, portable builds their own folder. Match the build type or settings go unread.
How do I run it portably?
Enable Create Portable Application in Settings. The program then runs self contained from any folder with local INI and databases. USB toolkits favor this mode for zero footprint operation.
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