Choose a quick category
Open the association protection page and choose Images, Archives, Audio, Video, PDF, Word, Spreadsheets, Presentations, Web pages, CAD drawings, 3D models, or E-books. The app already knows the common extensions in each category, so you do not need to identify them yourself.
Click an application
Choose one registered application, or use Choose another app to select an executable. Clicking the app applies the category immediately. The choice takes effect immediately; there is no separate Save step.
Do not select an installer or an unrelated helper executable.
Advanced: protect one single extension
For a format outside the quick categories, enter a value such as .abc and click an application. This single extension uses one protection-item slot even if it overlaps a built-in category; an exact custom extension takes priority when both are active.
Pause, enable, or remove a protection item
Return to Rules to manage each category or single-extension item. Every category or single extension uses one quota item. Pausing or deleting an item changes file protection only; browser protection has its own independent setting.