Thinstall has limited support for .INI / .INF files. When these files exist as a virtual file and the application tries to access them using the PrivateProfile family of API (such as GetPrivateProfileString) thinstall will extract or cache this file to disk and preform the operation on the disk version.
When the INI / INF file is marked Extract on Write / Memmap
Thinstall will extract the file to it is virtual path and INI access will occur with the normal file.
When the INI / INF file is marked Cache on Write / Memmap
Thinstall will cache the file to the cache directory. Because the cache directory can be set to any path, this method can be used to redirect an application's access to files on Read-only media such as CDROM or locations where the application normal does not have read or write access such as c:\windows\system32 when running as Guest accounts for Windows 2k/XP.
When the INI / INF file is marked Never Cache or Extract
This option should not be used for INI files as the application will not be able to use the PrivateProfile family of API functions.