We have got .pln,.inc,.t files ,which we use basically and after running them we get .res file thats nothing but result files. after the compilation we get .ino and .to files which are the object files and also we get .t_ , .inc_ and .pln_ files which are beckup files.
the above files are the basic ones . We do have ather files also like .vtp , .g.t , .txt .
I don't make software; I make it better.