how to open excel 2007 (.xlsx) file in R

i am unable to open a file which is saved as .xlsx format in R . The file
contains approximately  1,50,000 
rows. 

Use odbcConnectExcel2007 in package RODBC to read these data.

So I m not able to save it as csv file. 

I do not understand why you want to use R to convert an xlsx file to csv.
Even if you are a command line aficionado, I recommend to use the features
of Excel to do this.

Dieter

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