I assembled a list of illegal filename characters (considering UNIX, Mac OS X and Windows systems) based on some online research a couple of months ago. If the new filename contains any of these, there’s a risk that it might not be valid on all platforms.
private static final char[] ILLEGAL_CHARACTERS = { "https://stackoverflow.com/", '\n', '\r', '\t', '\0', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':' };
EDIT:
I would like to stress, that this is not a complete solution: as a commenter pointed out, even though it passes this test your file name could still be a Windows specific keyword like COM, PRN, etc. However, if your file name contains any of these characters, it will certainly cause trouble in a cross-platform environment.