Help with package that needs Compatibility mode to install

Hello community,
 
I have tried and tried with this and I’m not getting forward and would appreciate a bit of help.
 
We have a MSI from the WinXP era that will not show mapped drives when installing on W7 x64.  It will work post-install however we have to use a repair wizard to fix the drive.  If I install the program with compatibility mode however it shows the drives and works great.  This package needs to deploy to a thousand W7-x64 machines. 
 
I’ve been trying to create a compatibility shim with the Windows Compatibility Manager but it looks like it only makes shims for .EXE’s not an install environment for an MSI.  How do I accomplish this, and then, once I have a .SDB how do I employ it when pushing the package with Config Manager (SCCM 2007).
 
Thank you everyone.
If your wondering, it’s a early century package that uses an Access database to custom-fill Word templates and is customized in each state with specific language required by local laws.. templates stored on local drive and the database is stored on a network drive.  I don’t see how I could virtualize it but I wish it could be.
 

Yes, I know this is an old post, I’m trying to clean up older posts that are unanswered.
Did you ever figure this out?