Right, you'll have to get cmd running before you navigate to wherever ConvertXSI is located.
Start > Run > type in CMD.
The terminal should come up, so just type the path to where the file is. For example, if I had ConvertXSI in a folder directly off the C:\ drive, I'd type something that would look like this:
C:\ConvertXSI\convertxsi.exe
Ignore the part where it says C:\Documents and Settings\Your Name\
And then perhaps some text would come up, explaining that it's the program, ocpywrite info if there is any and stuff like that. If you don't know how to use it, the commands I mean, and it didn't come with a readme or some other help file, typing in 'help' usually provides you with some rudimentary commands.
By the way, Volt, First, there was 86-DOS. Then, there was PC-DOS. Then, Microsoft licensed PC-DOS and modified it, turning it into:
MS-DOS.
So, no, Microsoft did do this legally. HaAven't you ever heard of OS/2?