Bug description
When relative paths are used for the extra MetaSWAP files in the iMOD project (.prj) file, e.g.

006,EXTRA FILES
.\DATA\metaswap\fact_svat.inp
.\DATA\metaswap\luse_svat.inp
.\DATA\metaswap\meteo\mete_grid.inp
.\DATA\metaswap\para_sim.inp
.\DATA\metaswap\tiop_sim.inp
.\DATA\metaswap\init_svat.inp

this will result in a crash like:

Exception has occurred: FileNotFoundError
[Errno 2] No such file or directory: './DATA/metaswap/para_sim.inp'
File "C:\data\codes\git\imod-python_trunk\imod\msw\utilities\parse.py", line 47, in read_para_sim
with open(file, "r") as f:
^^^^^^^^^^^^^^^
File "C:\data\codes\git\imod-python_trunk\imod\msw\model.py", line 430, in from_imod5_data
parasim_settings = read_para_sim(path_to_parasim)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\data\projects\project_iMOD-Python\conversion\import_msw.py", line 37, in
msw_model = imod.msw.MetaSwapModel.from_imod5_data(imod5_data, dis_pkg, times)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: './DATA/metaswap/para_sim.inp'

Steps to reproduce
Simply specify relative paths for the extra MetaSWAP files.