Check files.sxp and ufiles.sxp (Product Files)

In this step, the Installer checks the files.sxp file and performs the following actions:

Edit the #InsDelFiles# section, and deletes the corresponding files from the target computer.
Mark files that cannot be deleted now, and deletes them at the next boot.
Edit the #CmpArchiveFiles# section, and unpacks the corresponding files from the files.cmp archive file.
Install or ignore each version-dependent file in the product being installed, according to the version-dependent installation setting specified for the file. It also updates the reference counter dependent uninstall setting for the file, if applicable.
Mark files that cannot be overwritten now, and overwrites them at the next boot.
Edit the #ReplaceParams# section, and replaces the corresponding parameters in unpacked files.

The Installer also prepares the ufiles.sxp information for the Logon function.