How to read xlsx files using file sender adapter in PI7.11

Hi All,

i have scenario where i need to read the xlsx file and convert it into idoc.

i have gone through the few bolgs

but not got proper result to read the xlsx file.

please guide me how can i achieve this scenario using standard way(like standard adapter modules,graphical mapping).

i saw in some blogs using API....

but i am not aware of the process of develop custom modules in PI.

please if there is any step by step process document to develop custom module for adapters.

thanks in advance.

mahesh