「圧縮ファイル・自己解凍」とのことだが、見られないんだが。
$ file ENIGMA.exe
ENIGMA.exe: PE32 executable (GUI) Intel 80386, for MS Windows
$ lha l ENIGMA.exe
PERMSSN UID GID SIZE RATIO STAMP NAME
---------- ----------- ------- ------ ------------ --------------------
---------- ----------- ------- ------ ------------ --------------------
Total 0 files 0 ****** May 5 11:58
$ 7zr l ENIGMA.exe

7-Zip (a) [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=ja_JP.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs x64)

Scanning the drive for archives:
1 file, 11642273 bytes (12 MiB)

Listing archive: ENIGMA.exe


ERROR: ENIGMA.exe : Can not open the file as archive



Errors: 1