Does anyone know a "simple way" to undo the Disk Cleanup step of "compressing old files"? I'd like to uncompress them "all" whatever compressed with this feature. What about the hidden files? I know uncompressing the files and folders manually (individually), but its too time consuming process. Thanks!
You can't and probably do not want to. It was done to save space it. The compression Disk Cleanup uses is not like "zipping" files.