lucene.net file formats and semantic

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C#

file

Lucene.NET

I do a simple indexing and searching program for a file folder consist of 24 text files.Now for indexing when I debug a program every time "Index" folder is created.when this folder is created it contains files named _1CFS file,deletable and segments.Then what these files contain and its use.
I use following piece of code::::



internal static readonly FileInfo indexloc =new FileInfo(@"C:\\Index")
//This is index folder

static void Main(string[] args)
{
FileInfo folder = new FileInfo(@"C:\\Documents")//This is file folder containing 24 files on which indexing has to do
}