Files and folders cannot be named '.' or '..', nor can they contain any of the following characters:
SQL Server 2005
You cannot name files and folders either '.' or '..'. For example, a file name such as ..sql is incorrect. Also, files and folders cannot contain the following characters:
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Pound (#).
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Percent (%).
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Ampersand (&).
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Asterisk (*).
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Vertical bar (|).
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Backslash (\).
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Colon (:).
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Double quotation mark (").
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Less than (<).
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Greater than (>).
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Question mark (?).
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Forward slash (/).
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Leading or trailing spaces (' '). Such spaces are stripped.
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Names reserved for Windows or DOS ("nul", "aux", "con", "com1", "lpt1", and so on).