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What is an FSTHUMB file?
An FSTHUMB file is a thumbnail image created by Wondershare Filmora, a video-editing program. It is used to show a thumbnail of a video-editing project in Filmora's menus. FSTHUMB files are not meant to be opened.
Wondershare Filmora is a video-editing program available for Windows and Mac. It allows users to create and edit video projects, which are saved as .WFP files.
When a user is browsing Filmora's menus, they may see thumbnail images representing their WFP files. These images are saved as FSTHUMB files. They are stored in the same folder as their associated WFP file.
How to open an FSTHUMB file
FSTHUMB files are not meant to be opened. You can view a Wondershare Filmora project's FSTHUMB file while browsing menus that show thumbnails in Filmora.