By default, the CMSi installer will reference file locations with mapped drive paths. However there are times when UNC paths need to be used instead as the mapped drives that a user sees may be different to those on the server where CMSi is being installed. 

The key files to customise are:

• CMSI-MDI.exe.config
• map/CMSI_LAYER_STUB.inc (especially if you get map errors saying there is no map object found but you do not have the rights to create one)
• map/base_layers.inc
• map/mylayers.inc

In the CMSI-MDI.exe.config, there are a number of lines to edit relating to the location of the map files, report library and startup icon. 

In the CMSI_LAYER_STUB.inc, you need to edit the line that points to the msplugin_mssql2008.dll

In the base_layers.inc and mylayers.inc, you may need to edit the lines that point to physical files. 

There is a key difference to how you add the UNC paths in CMSI-MDI.exe.config and CMSI_LAYER_STUB.inc compared to the mapping files. In the former, you add a UNC path as normal with two backslashes at the start e.g.  "\\Myserver\CMSi" but with the mapping files, the path must start with four backslashes.