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I'm adding my music to SkyDrive, and a file failed to sync with this message:

Error: This file name contains characters that aren't allowed.
Resolution: Please change the file name so it doesn't begin or end with a space, or end with a period.

The file name already doesn't begin or end with a space, or end with a period. The specific file name in question is:

Weaver At The Loom Before Now_ Was Then_01_Were Wild Animals (We Always Were).mp3

Since the suggested resolution isn't applicable, why is the real reason this filename doesn't work? And where can I find resources for resolving future issues? Note that the file syncs correctly in Dropbox.

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Did you try to shorten the filename? – Ramhound Nov 23 '12 at 1:52
Try renaming it file01.mp3, then rename it back. – Mark Allen Nov 23 '12 at 2:14
According to the Microsoft support forum, the maximum filename length for Skydrive is 230 characters. Yours being 77, I doubt that is the problem. Are you sure there isn't a space at the end of the filename? According to the following guide, that would cause an issue: – Oliver G Nov 23 '12 at 2:30
@OliverG: I'm absolutely sure. I ended up re-typing the name from scratch, and it uploaded then. Maybe one of the characters looked normal, but was actually an unusual character? – Matthew Pirocchi Nov 23 '12 at 19:00
"Maybe one of the characters looked normal, but was actually an unusual character?" - This was what immediately came to my mind as well when I read your question completely. I was going to advise you to copy-paste into Notepad, then save as ANSI and see if it complained. If there was a Unicode character, it would have either complained, or on re-opening the file you would have found some invalid ANSI character replaced with another. – Karan Nov 23 '12 at 21:29
up vote 2 down vote accepted

The file name may not begin or end with a space, end with a period, or include any of these characters: / \ < > : * " ? |

These names aren't allowed for files or folders: AUX, PRN, NUL, CON, COM0, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT0, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9

Source: SkyDrive FAQ

Besides that the path must contain fewer than 442 characters.

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