How to Register File in Windows:

For Window NT /XP / 2000 / Vista / W 7 users.

a. Copy the Comdlg32.ocx file given with the software to   
    Windows/system32 directory.

b. Go to dos prompt. ( i. e. Start - > Run - > Type Command )

c. Change directory to C:\windows\system32.

d. Now give command: regsvr32 Comdlg32.ocx

You will receive a message that file is registered.

Type exit to come out of Dos.
Similarly Register all other Files.