I'd never heard of this camera viewing application. A quick look for the application reveals it is capable of viewing USB cameras. So it mmay be possible to add an old x10 camera but since it doesn't have the ability to send x10 you'd have to switch your camera feed via a remote.
I believe most here still have one or more old style x10 cameras,however most of us have switched to the more reliable and better picture supplied by IP cameras.
I believe the xray multivitamin software would be a better choice for viewing those cameras while they still work.
If you have the newer x10 Ip cameras not the linked ones then Agent DVR will work with these and should be easy to configure.