Is it possible to get a url/downloaded file name change the "%20" to spaces? Like instead of downloading the file my%20file.pdf, download my file.pdf? I'd like to use PHP if possible...
I think you can use the Content-Disposition header to force a "Save As" dialog and recommend a file name like so:
header('Content-Disposition: attachment; filename="my file.pdf"');
The PHP.net page on header() seems to suggest the same.
You will need to make use of the Content-disposition header.
Here's a relevant answer. Here's what the header might look like:
Content-disposition: attachment; filename=my file.pdf
You could also use the reference for the header() function.