What is Rep2excel ?
Rep2excel is running on server side , It can convert .html file generated by oracle report server to excel format , you can download the excel file via browser .That means , you can browse you report in excel format via IE just like report in HTML format .
Rep2excel can convert report not only in HTML but also in HTMLCSS format to excel format.

How does rep2excel works?
The current version of rep2excel is a CGI application running on win32 platform . You can execute the application inside Apache server (oracle http server is based on apache server ) . After oracle report server output report into a html file, you can invoke the application to convert the oracle report to excel thru web-browser