// Retrieves the active uploaded file for the given attachment in the given project form, and saves
// the file at the given filepath.

public void SaveActiveAttachment(string programId, string projectId, string formId, string attachmentId, string filePath, string username, string password, string apiKey)
{
    string url = "/Programs/" + programId + "/Projects/" + projectId + "/Forms/" + formId +
"/Attachments/" + attachmentId + "/Download";
    MakeGetFileRequest(BaseUrl + url, filePath, username, password, apiKey);
}