Unfortunately LinkPlayer is written for Apples on account of how bad B&O had let their support become (since then they did provide some support for BM-Link to be improved).
If you want audio+visual integration then you are going to have to research at a range of options and then choose the best for yourself.
The advantage that something like LinkPlayer has is that it integrates a range of media helpers (e.g. PLEX and its plug-ins) with the B&O world via a BeoPort ... the result is integrated video, integrated audio, and integrated control (i.e. Beo4 support).
The one possibility that I am not familiar with the MLGW - the MasterLink GateWay ... but I suspect it will cost more and not deliver the options you initially asked for.
What will be your video connection between the existing PC and the BV7-40 ?
Also read the Beo-PC and Beo-MAC forums as part of your researching !
You will learn a lot, become confused, seek clarity, gain enlightenment, have fun, and eventually find the combination that is right for you.
Also time is on your side given how much the TV world will change this year as Google, INTEL and Apple all bring products and enhancements to the market in the battle for the control of your living room
First B&O (1976) was a Beogram 1500 ... latest (2011) change has been to couple the BL11 with the BL6Ks *sounds superb*