Hello,
Thank you for reaching out with your question about Fluka user routines and input/output files. It sounds like you are trying to run the input file flex_03.inp in Fluka, but you are also seeing a writect.f file associated with it. Additionally, you mentioned that in a different application, the output files include head.vxl and ascii_head files. You are wondering what steps you need to take in order to see these files in your output when running the input file.
First, let me clarify that the writect.f file is not an executable file. It is a user routine file that contains code that can be called by Fluka during the simulation. It is important for you to have this file in order for Fluka to properly run the simulation.
To see the head.vxl and ascii_head files in your output, you will need to make sure that the appropriate user routines are included in your input file. This may involve adding the writect.f file to your input file and specifying its location. You may also need to specify the output format you want for the head.vxl and ascii_head files in your input file.
I recommend consulting the Fluka user manual or reaching out to the Fluka community for specific guidance on how to properly include these user routines in your input file and specify the desired output format. I hope this helps and good luck with your simulation.