LoaFilenames is a .NET library for decoding LostArk filenames
Use the nuget package manager install LoaFilenames.
dotnet add package LoaFilenames.Libusing LoaFilenames.Lib;
var decoder = new FilenameDecoder();
//returns 'textures'
decoder.Decode("LOD9LS7OEDEP1EBMOHOT5O");