This is NOT fixed and terribly annoying! Using latest beta, Version184.108.40.20601 (64-bit). Yes, now it is possible to uncheck .webp checkbox, but after closing Maxthon and reopening it assignes itself as program for these filetypes again (Win10 x64 22H2). Sometimes it's not checked on settings page immediuately, but becomes checked after updating the page. Please fix properly!