THE INFORMATION IN THIS ARTICLE APPLIES TO:
SYMPTOM
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.'
CAUSE
EFT will throw an error if it is unable to decompress a file with an invalid format 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 used 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 article.
Compression format standards use 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.
RESOLUTION/WORKAROUND
Change your event rule action to use "AutoDetect" or identify the file that is failing and make sure the file is using the correct format that matches the extension.
