Not Perl, but similarly handy is the "Open Command Window Here" PowerToy free from Microsoft.
Another fun thing is "start some_dir" from the command line to pop up a file explorer for that directory. (E.g. "start ." to see the explorer for the current directory).
start has other neat uses. Given a filename, it will open the file up the default app for that filetype. Handy for .html files, for example. Type "help start" at the command line for more details.
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