go-pear.phar file error and unknown charachters

I want to install PEAR and I’m using PHP 8.1.0
I’m following this tutorial: https://pear.php.net/manual/en/installation.getting.php

The error is in the go-pear.phar file and I found it here: https://pear.php.net/go-pear.phar

And I have an error when I try:
php go-pear.phar
The error is:

Fatal error: Uncaught Error: Failed opening required ‘phar://go-pear.phar/index.php’ (include_path=’.;C:phppear’) in C:wamp64binphpphp8.1.0go-pear.phar:1284
Stack trace:
#0 {main}
thrown in C:wamp64binphpphp8.1.0go-pear.phar on line 1284

My line 1284 and the following ones are:
enter image description here

Does someone know what I can do or where I’ve to search to solve this problem?