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Spaces in names are definitely not the problem. Most likely you have a backup taken on a Linux server and you're trying to restore it on Windows. There are a few things which could affect the ability of the operating system to write to the file. I'd like to clarify that Kickstart does NOT (and can not) create the file. Kickstart asks PHP which asks the Operating System. Whether a file is created or not is not controlled by the code we have written. It's not even controlled by PHP itself. It is 100% up to the Operating System you are using.

So here are some factors in play:

Does the path contain invalid characters? Linux is far more permissive in which characters can be used in the name of a directory or a file. Windows, not so much. Things like questions marks, dollar signs etc are invalid under Windows but valid under Linux. If such characters are present anywhere in the directory or file name Windows cannot create the file.

Is the path length over 250 characters? This is the full path, including the drive name e.g. c:\foo\bar\baz\bat\your_site\some\long\path\to\your file.pdf. If that's longer than 250 characters Windows won't create the file and report a failure.

These are all restrictions of the operating system. There is nothing we can do at backup or restoration time. Anything we would do would change the name and path of files which would lose or modify information on your site. Therefore it would no longer be a true backup of your site.