Add files to Quartus thanks to a list file

Hello,

Until now, when I want to add files to my project, I modify .QSF file by adding a line:

set_global_assignment -name IP_FILE filename1.ip
set_global_assignment -name IP_FILE filename2.ip

Now I would like to include all the files into one text file and add this (only) file into the project.

For example (it should be easier to understand):

I've got two files: filename1.ip and filename2.ip.

Instead of having two lines into the .QSF:

set_global_assignment -name IP_FILE filename1.ip
set_global_assignment -name IP_FILE filename2.ip

I'd like to add only one line (in the .QSF); such as

set_global_assignment -name xxx_FILE filelist.txt

with filelist.txt containing the two path to the IP:

set_global_assignment -name IP_FILE filename1.ip
set_global_assignment -name IP_FILE filename2.ip

If I use '.QIP' extension and 'set_global_assignment -name QIP_FILE filelist.qip', Quartus complains 'Critical Warning(125091): Tcl error: ERROR: Option "-qip" for "IP_FILE" assignment is illegal. Specify a legal option or remove the option.'

If I use '.IP' extension and 'set_global_assignment -name IP_FILE filelist.ip', Quartus complains 'The synthesis RTL for ../src/filelist.ip has not been generated'.

I know that I can modify the .QSF (using SED or AWK) but I'd like something simpler (main objective is to automatically list all IP files present into a directory (with a 'ls' command) and put this list in the filelist.txt file).

Many thanks!