@Noutrious I thing that the letters is not a critical problem, if you download the addon and install it you will see that the other letters of the addon is regular.
@Thelmrac The (unrar.exe) file that is include into the addon helps to automatically unrar the new downloaded version of this addon, the (unrar,exe) file has been created from the WinRaR GmbH company (Alexander Roshal) and has not include any virus or anything else!
@Lenoox This issue has been fixed into the next addon version!, Thanks!