Unix环境Posit Workbench中程序化下载文件至Windows本地机器的报错排查求助

大家好，我现在碰到了一个棘手的问题想请教各位：我在Chrome浏览器里使用运行在Unix服务器上的Posit Workbench，想要通过R代码程序化地把服务器上的一个.tex文件下载到本地Windows电脑，但尝试的代码一直报错，具体细节如下：

我写的代码是这样的：

# File on Unix server
unix_file <- "/users/tables_figures/file.tex"
url <- paste("file://", unix_file, sep="")

# Destination on local Windows machine
local_file <- "C:/Users/myname/tables_figures/file.tex"

# Download the file
download.file(unix_file, destfile = local_file, mode = "w", method = "auto")

运行之后出现了下面的错误和警告：

trying URL '/users/tables_figures/file.tex'
Error in download.file(unix_file, destfile = local_file, mode = "w", method = "auto") : 
  cannot open URL '/users/tables_figures/file.tex'

In addition: Warning message:
In download.file(unix_file, destfile = local_file, mode = "w", method = "auto") :
  URL '/users/tables_figures/file.tex': status was 'URL using bad/illegal format or missing URL'

有没有大佬能帮我看看问题出在哪儿，应该怎么修改才能成功把服务器上的文件下载到本地Windows机器呢？

备注：内容来源于stack exchange，提问作者Grillo