The film you're referring to is "The Lunchbox" (original title: "Dabbawala").

Directed by Ritesh Batra, it won the Critics' Week Viewers' Choice Award at the Cannes Film Festival in 2013. The movie received critical acclaim for its unique storyline and performances, making it one of the notable Indian films recognized internationally.

Hello,

The Indian film that won the Critics Week Viewers Choice Award at the 2013 Cannes Film Festival is "The Lunchbox" directed by Ritesh Batra.

This romantic film was screened at the International Critics' Week and later won the prestigious Grand Rail d'Or award “The Lunchbox" is among the few Indian films that have received international recognition and accolades

Hello,

"The Lunchbox" is an Indian film that won the Critics' Week Viewers Choice Award, or the Grand Rail d'Or, at the Cannes Film Festival 2013. The poignant direction by Ritesh Batra helps to render this film one of the few Indian films that gained international recognition.

The subtle narrative, brilliant performances, and the simple yet powerful storytelling has made audiences and critics to go weak in their knees at Cannes and became one of the standouts. Recognition placed "The Lunchbox" alongside some of the finest Indian films celebrated on the global stage, drawing the attention of the world's cinema to India.