Replace text in file

Reads a file, replaces all occurrance of a string with a new string and writes result to a new file. This is a very simple program, but it works tons faster than Notepad's (and many other programs') replace for large files. Note: The "Entire File" option allows replacing text accross lines, but requires reading whole file at once, so it won't work well for large files. Possible enhancements would be multi-file support, file open dialogs, command line options, etc. I may add some of these features if requested or if I find use for them.