Chrome currently supports only a small subset of ActiveX components entirely on purpose, and it's never going to support them all, and especially lots of random 3rd party propriety ones.
Why?
Because ActiveX is a mess - it's a huge security hole and all the components can run at a higher security level than the browser.
That means that if you let in an ActiveX component it owns your PC - and while many are not malign most are resource hogs. Also if a malign site can't hack your browser it might still be able to hack one of its ActiveXs.
This is completely against Chrome's sandbox everything and wall off every tab approach - the reason why Chrome is by far the quickest, most secure and most stable browser is the same reason that it currently only supports Flash, Silverlight and one or two more.
However, it sounds like you're not really developing a web application anyway - your site in IE is basically a portal to downloading further ActiveX-based applications. Why worry about supporting anything that your DVR clients with their coding teams writing ActiveXs don't?