File Name conventions in VBA|VBA & Macros|Excel Forum|My Online Training Hub

Hi, I have created a macro that steps through folders and opens each individual workbook runs a standard macro in that workbook closes the file and moves onto the next file until all have been done.
I have used Application.Run (File.Name & "!UpdatePeriod") to call and run the macro, where UpdatePeriod is the macro name in each workbook. The issue I have is that if the filename may contain spaces or characters like (&-) and then the macro stops saying that it cannot access the macro. At the end of the macro I am resaving the file with a different name including the current period. Are there any guidelines or rules that I should be following in terms of naming conventions so that opening the file and running the macro is not an issue?

Many thanks in advance.