Because it is not a core Windows file, malware authors can name a malicious file xtoolui.dll to disguise it. If you find this file running or located in a suspicious folder (like C:\Windows\Temp or a random folder in AppData ), it warrants further investigation.
Optimizes files before final compression to achieve better ratios. xtoolui.dll
: Recent versions of the UI include a "library checker" to help users verify they have the necessary plugins and libraries for specific compression codecs. Key Features in the UI Because it is not a core Windows file,