无法运行带有脚本中引用参数的程序，但可以直接从命令行运行它

Question

我有这个脚本（在我的个人资料中别名为ydl）：

param(
    [string]$url,
    [switch]$vid=$false
)

$ydl = "D:\youtube-dl\youtube-dl.exe"

$mp3conf = "--config-location `"D:/youtube-dl/config-mp3.txt`""
$vidconf = "--config-location `"D:/youtube-dl/config-mp4.txt`""

$finalArgs = $mp3conf

If ($vid) {
    $finalArgs = $vidconf
}

Write-Host $ydl $url $finalArgs
& $ydl $url $finalArgs

Powershell 输出：

PS D:\> ydl https://www.youtube.com/watch?v=c_7Mcb6iLN0
D:\youtube-dl\youtube-dl.exe https://www.youtube.com/watch?v=123 --config-location "D:/youtube-dl/config-mp3.txt"
Usage: youtube-dl.exe [OPTIONS] URL [URL...]

youtube-dl.exe: error: no such option: --config-location D:/youtube-dl/config-mp3.txt

好吧？真不幸……但如果我尝试直接运行该命令——Write-Host从脚本的输出中复制它，会怎么样？

Powershell 说参数列表的结果如下：
D:\youtube-dl\youtube-dl.exe https://www.youtube.com/watch?v=123 --config-location "D:/youtube-dl/config-mp3.txt"

好的，我们来尝试一下：

PS D:\> D:\youtube-dl\youtube-dl.exe https://www.youtube.com/watch?v=123 --config-location "D:/youtube-dl/config-mp3.txt"
[youtube] 123: Downloading webpage
[youtube] 123: Downloading video info webpage
[youtube] 123: Extracting video information
[youtube] 123: Downloading MPD manifest
[download] Destination: D:\youtube-dl\MP3\123.webm
[download] 100% of 2.48MiB in 00:00
[ffmpeg] Destination: D:\youtube-dl\MP3\123.mp3
Deleting original file D:\youtube-dl\MP3\123.webm (pass -k to keep)

怎么回事？它在命令行中可以工作，但在脚本中却不行？