It is more a function of the operating system and how it has been told to display files.
Windows is most prone to this, a leftover of the 8.3 filename structure.
Avoiding characters that are used in filepaths on various operating systems is a GOOD idea.
periods, slashes, colons, etc.
underscores or dashes are the common concensus. http://filemakerstandards.org/display/cs/Naming+Conventions
Filenames are OS based, which means it has to obey the operating system rules. In the same manner you can't use dates with slashes in filenames. A period is use before the file extension. You can use a dash or an underscore.
Yeah .... figured that was the case but hoped not. period just look so much cleaner! haha Ok I'll be sure to fix it, thanks!