Applicants are now limited to using the following characters in all attachment file names.
Attachment Filename Characters are now Validated and Enforced:
Beginning August 15, 2012, applicants are now limited to using the following characters in all attachment file names.
Valid file names may only include the following UTF-8 characters: A-Z, a-z, 0-9, underscore ( _ ), hyphen (-), space, period.
If applicants use any other characters when naming their attachment files their applications will be rejected.
Further information can be found on the Grants.gov web site Technical Alerts.