Script to fix dotnet35 for steamapps. may not work with all apps

fix_dotnet35_steamapp.sh

#!/bin/bash

# First sanity check
if [ -z "$1" ]
  then
    echo "No app name supplied will exit"
    exit
fi

if [ -z "$2" ]
  then
    echo "No app code supplied will exit"
    exit
fi

# Can work with multiple proton version
PROTONVERSION="4.2"
if [ -z "$3" ]
  then
      echo -e "no proton version supplied will use 4.2\n"
  else
      PROTONVERSION=$3
fi

# final folder paths :
STEAMdotnetfx35FOLDER="$HOME/.steam/debian-installation/steamapps/common/$1/Dependencies"
STEAMAPPFOLDER="$HOME/.steam/debian-installation/steamapps/compatdata/$2"
PROTONFOLDER="$HOME/.steam/debian-installation/steamapps/common/Proton $PROTONVERSION"

# checking for dotnetfx exe to launch
if [ -d "$STEAMdotnetfx35FOLDER" ] 
then
    echo -e "found dotnetfx exe at : $STEAMdotnetfx35FOLDER \n"
else

    echo -e "Warning: could not find dotnetfx exe at $STEAMdotnetfx35FOLDER \n"
fi

# Sanity check
if [ -d "$STEAMAPPFOLDER" ] 
then
    echo -e "found steam app at : $STEAMAPPFOLDER \n"
else
    echo -e "Error: could not find steam app at $STEAMAPPFOLDER \n"
    exit
fi
if [ -d "$PROTONFOLDER" ] 
then
    echo -e "found proton data at : $PROTONFOLDER \n"
else
    echo -e "Error: could not find proton data at $PROTONFOLDER \n"
    exit
fi

# following https://steamcommunity.com/sharedfiles/filedetails/?id=1828877648
# You get into the folder with Proton prefix,
cd "$STEAMAPPFOLDER"
# you backup the Steam folder into the folder you are currently in and remove the prefix.
cp -r "pfx/drive_c/Program Files (x86)/Steam/" . 
rm -r pfx

# After 32 bit wine prefix is created, winecfg window will open. 
# While you're at it, set Windows version to Windows XP
# otherwise you won't be able to install the .NET the way I show.
WINEPREFIX="$STEAMAPPFOLDER"/pfx WINEARCH=win32 winecfg

echo -e "\nWARNING : et Windows version to Windows XP\n"


# For reasons unknown to me, Proton keeps crashing unless the folder syswow64 is created.
# After that, you can just copy the Steam folder backup into Program Files folder.
mkdir pfx/drive_c/windows/syswow64/

cp -r Steam "pfx/drive_c/Program Files/"

WINEPREFIX=$PWD/pfx WINEARCH=win32 wine "$STEAMdotnetfx35FOLDER/dotnetfx35.exe"
cd "$PROTONFOLDER"
sed -i 's/wine64/wine/' proton