THE INFORMATION IN THIS ARTICLE APPLIES TO:
Getting an error when EFT is decompressing a file using even rules decompress action.
ERROR Event.CompressDecompressActions <> Compression Agent has return code 102 : 'Invalid input magic number.'
EFT will throw an error is it is unable to decompress a file that the format is invalid or if the file was created with a different compression format. File extensions are typically used to determine the compression method used, however, in some cases files can be named with a file extension that is not the compression format. When you specify the format to be use to decompress a file and the file was created with different format EFT will fail to decompress the file. throwing error messages like the one in this artcile.
Compression format standards uses an internal file signature within the file content called "magic number" or "magic bytes" to identify the compression format used. visit https://en.wikipedia.org/wiki/List_of_file_signatures for more information.
Change your event rule action to use "AutoDetect" or identify the file being failing and make sure the file is using the correct format that matches the extension.