Choose Compress to compress files using live file compression, or Uncompress to uncompress the files.
You may need to uncompress the files if the compression causes problems. Because the file compression is built into Windows and guaranteed by Microsoft, this is highly unlikely. However, a basic design principle of Advanced Uninstaller PRO is that you should be able to undo your own actions in the program, if possible. So, we are giving you the option to uncompress.
More information about Live File Compression