The tool was originally created by the lead developer of Cemu and can be found on GitHub via cemu-project/WudCompress John-Gee's repository Look for a pre-compiled file from trusted community sites like
Click and hold the .wud file, then wudcompress.exe . wudcompress install
Download the ZIP file (usually around 50 KB) and extract its contents into a folder of your choice. The tool was originally created by the lead