Undertale does not start

[Parindraa]

I get this error, I have the windows copy, I renamed the data.win to game.unx, i couldnt find the runner file in the windows game files so i copied and pasted the runner file from your repo and tried to start it, this is what i got.

***************************************
*     YoYo Games Linux Runner V1.3    *
***************************************  
CommandLine: -game game.unx
ExeName= /opt/retropie/ports/Undertale/runnerGames Linux Runner V1.3    *
***************************************  

MemoryManager allocated: 29256
SavePrePend /home/pi/.config/UNDERTALE/ 
GAMEPAD: Initialising Ubuntu support
Attempting to set gamepadcount to 32
GAMEPAD: Enumerating 3
Joystick: Microsoft X-Box 360 pad, bustype = 3, vendor = 0x045e, product = 0x028e, version = 276
looks like a joystick with guid : 030000005e0400008e02000014010000
Joystick has button: 0x130
Joystick has button: 0x131
Joystick has button: 0x133
Joystick has button: 0x134
Joystick has button: 0x136
Joystick has button: 0x137
Joystick has button: 0x138
Joystick has button: 0x139
Joystick has button: 0x13a
Joystick has button: 0x13b
Joystick has button: 0x13c
Joystick has button: 0x13d
Joystick has button: 0x13e
Joystick has absolute axis: 0x00
Values = { -1, -32768, 32767, 0, 128 }
Joystick has absolute axis: 0x01
Values = { -1, -32768, 32767, 0, 128 }
Joystick has absolute axis: 0x03
Values = { 0, -32768, 32767, 16, 128 }
Joystick has absolute axis: 0x04
Values = { 0, -32768, 32767, 16, 128 }
Joystick has hat 0
Values = { 0, -1, 1, 0, 0 }
steamfile:/opt/retropie/ports/Undertale/steam_appid.txt
Steam being initialised with appId 391540
Steam_Init
Error: Failed to load libsteam_api.so: libsteam_api.so: cannot open shared object file: No such file or directory
Failed LoadSteamLib() call: Error loading libsteam_api.so
SteamInit failed: Error loading libsteam_api.so
Steam restarting via client
Attempting to set gamepadcount to 0
Not shutting down steam as it is not initialised
Script_Free called with 0 and global 0

[Parindraa]

Was I supposed to have a undertale linux version and a undertale windows version?

[Parindraa]

I am using retropie on pi 4