I've just installed Composer and then tried to run it, but it fails:
prompt>composer '""' is not recognized as an internal or external command, operable program or batch file. prompt>composer -v '""' is not recognized as an internal or external command, operable program or batch file.
I checked Env Paths... There is no answer related to this problem in the Internet.
UPD:
Program installed via win installer from getcomposer web site. It's placed in its default location.
C:\>where composer
C:\OSPanel\modules\php\PHP_7.1-x64\composer.bat
C:\ProgramData\ComposerSetup\bin\composer
C:\ProgramData\ComposerSetup\bin\composer.bat
C:\>php -v PHP 7.1.22 (cli) (built: Sep 13 2018 00:43:40) ( ZTS MSVC14 (Visual C++ 2015) x64 ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies.