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What is a QLPLUGIN file?
A QLPLUGIN file is a plug-in for QuickLook, which is the unofficial Windows version of macOS's Quick Look tool. It is installed by previewing the QLPLUGIN file in QuickLook and clicking the Click here to install this plugin. button that appears. QLPLUGIN files are similar to macOS's .QLGENERATOR files.
QuickLook is an unofficial Windows port of macOS's Quick Look feature, which allows users to preview a file by selecting the file and pressing their spacebar. QuickLook supports previewing a variety of files by default, but QuickLook plug-ins allow users to preview even more types of files.
QuickLook plug-ins are stored in QLPLUGIN files. A list of available QuickLook plug-ins and the file types they support can be found at QuickLook's GitHub page, which is linked below.
How to open a QLPLUGIN file
QLPLUGIN files are not meant to be opened. Instead, they are meant to be installed while using QuickLook (Windows). After you download a QLPLUGIN file, you can install it by previewing the QLPLUGIN file in QuickLook. In the preview window, select the Click here to install this plugin. button to install your QLPLUGIN file.