Edit script file with salt-stack

There is a powershell script file on windows minions which has some parameters set the same on all minions and some parameters set individually per-minion. I want to create a state for modifying some global parameters. I cannot replace the whole file, as that would remove the individual parameters.

I thought of using file.line or file.replace, but both run into a wall giving an error related to encoding of the file:

UnicodeDecodeError: 'charmap' codec can't decode byte 0x88 in position 73: character maps to <undefined>

I checked the file encoding and it is UTF-8 with BOM:

Format-Hex -Path 'C:\Program Files\the_app_name\the_script.ps1' -Count 3

   Label: C:\Program Files\the_app_name\the_script.ps1

          Offset Bytes                                           Ascii
                 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
          ------ ----------------------------------------------- -----
0000000000000000 EF BB BF                                        

I thought it could be solved by simply adding argument "encoding", but according to the documentation, neither file.line nor file.replace accept that parameter. I had no luck reading documentation, searching the internet or consulting LLM.

Does anyone have this experience and did you manage to resolve it?

Here is the salt state:

{% if (grains['os_family'] == 'Windows') %}
update_defaultRetryCount:
  file.line:
    - name: 'C:/Program Files/the_app_name/the_script.ps1'
    - match: '^\$defaultRetryCount'
    - mode: replace
    - content: '$defaultRetryCount = 6 #Sets the global number of retries for certain situations'

update_defaultRetryTimeout:
  file.line:
    - name: 'C:/Program Files/the_app_name/the_script.ps1'
    - match: '^\$defaultRetryTimeout'
    - mode: replace
    - content: '$defaultRetryTimeout = 300 #Sets the time in Seconds the script is paused for another retry.'

{% elif grains['id'] == 'SaltMaster'%}
Warning:
  event.send:
    - data: "Skipping SaltMaster."
{% endif %}