PS转换二进制编码问题

网上找的代码可以将二进制程序生成base64的字符串并存储在b64.txt中，执行了代码没有报错但是也不见生成b64.txt,代码如下

function Convert-BinaryToString {
 [CmdletBinding()] param (
 [string] $FilePath
 )
 try {
 $ByteArray = [System.IO.File]::ReadAllBytes($FilePath);
 }
 catch {
 throw "Failed to read file. Ensure that you have permission to the file, and that the file path is correct.";
 }
 if ($ByteArray) {
 $Base64String = [System.Convert]::ToBase64String($ByteArray);
 }
 else {
 throw '$ByteArray is $null.';
 }
 $Base64String | set-content ("b64.txt")
}