SiteCatalyst: File Naming Convention while sending a report

While sending a report from Sitecatalyst with 'date appended', there are blanks in the file name.

(e.g.)  views-february 2012

It will be great if there are no blanks.

For example, the blanks can be filled with underscores. (OR)  Follow the same file naming convention as SiteCatalyst Data Warehouse.