Tool to decompress/compress PNG's to etc1-compressed data and vice versa.
Just type in "etc1tool.exe -help" in the command line to get a list of commands and an fundamental explanation.
This tool is only really useful in combination with other tools for the Ace Attorney Trilogy translation. Come here to get more information about the project and this tool in general: http://gbatemp.net/threads/translation-ace-attorney-trilogy.444652/