article words compare program

I need a PC client software, which can work on Windows 7 and Windows 8 both 32bit and 64bit system. Better use C# to develop it. Details of functions requirements: 1. Import two or more (maybe a hundred or thousand) text files to compare the same word, highlight the same words base on the specific number, a. number=1, highlight all same words b. number =2 highlight will discard single same word c. number =3 will discard single and two same word d. and more, allow to setup any umber 2. Count the same ratio base on the specific number, can setup the ratio display color base on the same ratio, 20% using green, 21%-49% using yellow, <50% using red, allow manually adjust the ratio. 3. Two window form design a. First, import files and user settings, and perform compare and display the same ratio b. Second, text compare review window, and text modify and delete function. 4. Multi thread compare support 1. Allow only compare selected article. 2. Allow click the button to delete articles hard disk, and also allow delete base on the same ratio. 3. Same ratio window allow manually zoom in and zoom out depend on the display column and line. 4. License management: two license free, and full, license active restrict the H/W ID, one license only allow use one computers. two sample windows see attached file.