Removing Other Packages' Conflicting Files

[ms419@freezone.co.uk]

I am packaging a package - A - which conflicts with only some files in 
another package - B - (A depends on the rest of B's files). If A also 
contained the files in B with which it conflicts, I think I would tag A 
Replaces: B and be done; but A doesn't contain these files, it simply 
conflicts with them, so they must be removed.

How do I stop files from B from being installed? If I simply put rm 
<files> into A's postinst script, the files could be reinstalled the 
next time B is upgraded.

Thanks for your help!

Jack