Cannot Change Filename (Source and Destination filenames are the same)

Let's say " 01 - come.aaa" (A space at the beginning) is the file name.
I am trying to change it to "01 - come.aaa"(without the space at the beginning).
I am coming up with this error: "Source and destination file names are the same".

1) Is this fixable? How?

2) How can I find all files on my computer (and external drives) with a space at the beginning in the filename (and of course how can I change them with this error coming up)?

3) Is it a problem to have a space at the beginning in the filename (These files will be used in Mac and Linux too) ?

Thanks.

AFAIK, win7 doesnt allow creating files and folders with leading spaces in their names. So how did you create these files or are they imported from another OS?

Generally speaking, spaces in filenames are a bad idea. They are troublesome to use in the command line and in scripts. Certain file- and image- hosting websites remove or replace spaces. Certain tools dont work with spaces in filenames. And filenames get unnecessary longer.

They have been created by Microsoft SyncToy after a syncronization. (Unless the filenames have been changed before because of some security issue as mentioned in the other thread).
I wish I could take that syncronization back (undo) because right now I don't know all the files and folders affected).

I was able to change the files with a program called Better File Rename.
Back to my question, why wasn't I able to do this from Windows Explorer?

Windows explorer sees a filename with leading spaces SAME as a filename without leading spaces. Try creating a test file/folder with a leading space, the spaces are automatically removed.

Thanks for your reply.
Yes, I know that; that is why I was surprised to have double file names in Windows Explorer.

SyncToy didn't do it...I've used it for years without a hint of any behavior like that.