CPACK_INSTALL_SCRIPTS executed without the files being present

I’m trying to make a .msi installation package using CMake, CPack, and Wix. The issue is I’m trying to sign the executables and DLLs that are going to be installed.

SET( CPACK_INSTALL_SCRIPTS "${CMAKE_CURRENT_LIST_DIR}/signcert.cmake")

Inside the signcert.cmake, I have:

execute_process(
    COMMAND cmd /c signtool sign /debug /v /sm /fd sha256 /tr http://timestamp.comodoca.com /td sha256 /sha1 ${THUMBPRINT} "${CMAKE_INSTALL_PREFIX}applications/bin/*"
)

However, this does not execute properly. To debug the issue, I put the following lines inside signcert.cmake

file(GLOB MY_FILES_TO_SIGN
     LIST_DIRECTORIES false
    ${CMAKE_INSTALL_PREFIX}applications/bin/*.exe)
message(FATAL_ERROR ${MY_FILES_TO_SIGN} ${CMAKE_INSTALL_PREFIX}applications/bin/)

When the program exits, I expect to see files inside ${CMAKE_INSTALL_PREFIX}applications/bin/, however no files were observed and the folder was not created. the message also indicated that ${MY_FILES_TO_SIGN} was empty (no .exe file was found in that folder).

If I comment out message(FATA_ERROR …), files inside the directory were observed, does this mean that CPACK_INSTALL_SCRIPTS actually called the script before the .exe and .dll were locally installed?