You must clean the content of the dat file. Use a simple text editor like NotePad or Vim. This is what I get when I open your current dat file:
{\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fch****t0 Calibri;}}
{\*\generator Msftedit 5.41.21.2509;}\viewkind4\uc1\pard\sa200\sl276\slmult1\lang9\f0\fs22 Obj=building\par
Name=SubwayEntrance\par
# must be 1*1\par
type=stop\par
waytype=road\par
intro_year=1750\par
noconstruction=1\par
enables_pax=1\par
NoInfo=1\par
Dims=1,1,2\par
level=1\par
BackImage[0][0][0][0][0][0]=bs2.0.0\par
FrontImage[0][0][0][0][0][0]=bs2.0.1\par
BackImage[1][0][0][0][0][0]=bs2.0.2\par
FrontImage[1][0][0][0][0][0]=bs2.0.3\par
icon=> bs2.0.5\par
cursor=bs2.0.4\par
}
and It should look like this one...
Obj=building
Name=SubwayEntrance
# must be 1*1
type=stop
waytype=road
intro_year=1750
noconstruction=1
enables_pax=1
NoInfo=1
Dims=1,1,2
level=1
BackImage[0][0][0][0][0][0]=bs2.0.0
FrontImage[0][0][0][0][0][0]=bs2.0.1
BackImage[1][0][0][0][0][0]=bs2.0.2
FrontImage[1][0][0][0][0][0]=bs2.0.3
icon=> bs2.0.5
cursor=bs2.0.4