[R] Error in reading netcdf files into R

[mamuash bukana]

Dear all,
I have installed necessary packages such as ncdf4 and RNetCDF. But
still my machine can't read netcdf files into R. Below are the file
formats and the respective errors:

> open.nc("cru.ts3.23.1901.2014.tmx.dat.nc")
Error: No such file or directory

> open.nc("cru_ts3_23_1901_2014_pre_dat.nc")
Error: NetCDF: Unknown file format


I am using Windows 7 64-bit.


Thanks for your suggestions and comments in advance

Mamuash