Googlebot is indexing all my bills as XLS

[martinszy]

I don't know if this is good or bad, but they are consuming the service:

Started GET "/proyectos/6103-D-2012.xls" for 66.249.64.173 at 2014-06-18 21:37:22 +0000
Processing by BillsController#show as XLS
Parameters: {"locale"=>"es-AR", "id"=>"6103-D-2012"}
Rendered bills/show.xls.eku (101.0ms)
Completed 200 OK in 3665ms (Views: 227.1ms | ActiveRecord: 0.0ms)
Started GET "/proyectos/2309-D-2012.xls" for 66.249.64.163 at 2014-06-18 21:39:34 +0000
Processing by BillsController#show as XLS
Parameters: {"locale"=>"es-AR", "id"=>"2309-D-2012"}
Rendered bills/show.xls.eku (31.1ms)
Completed 200 OK in 902ms (Views: 33.3ms | ActiveRecord: 0.0ms)
Started GET "/proyectos/2446-D-2012.xls" for 66.249.64.173 at 2014-06-18 21:43:41 +0000
Processing by BillsController#show as XLS
Parameters: {"locale"=>"es-AR", "id"=>"2446-D-2012"}
Rendered bills/show.xls.eku (30.1ms)
Completed 200 OK in 2336ms (Views: 32.5ms | ActiveRecord: 0.0ms)
Started GET "/proyectos/7476-D-2006.xls" for 66.249.64.173 at 2014-06-18 21:45:20 +0000
Processing by BillsController#show as XLS
Parameters: {"locale"=>"es-AR", "id"=>"7476-D-2006"}
Rendered bills/show.xls.eku (64.4ms)
Completed 200 OK in 1089ms (Views: 65.9ms | ActiveRecord: 0.0ms)

Should we write something in the robots.txt file?

[jdgarrido]

maybe you can use:
User-agent: Googlebot
Disallow: /*.xls$

[martinszy]

La verdad es que el echo de que tenga un $ al final hace que sean indexables todas las urls con la forma;
proyectos/busquedas.xls?authors=Lino+Walter+Aguilar&creation_date_max=2014-09-17&creation_date_min=1990-03-01&page=10910

Al sacarle el $ las bloquea.
Quieren actualizar también su versión?
A mi me trae problemas de performance.