Reads files inside resources sub folder and turn them into resource script. With certain replacement of special chars, Slash (\), Space ( ), Dash (-) all converted to underscore.

buildrc.cmd

@echo on>resources.rc
@echo off
setlocal enabledelayedexpansion
set "parentfolder=%__CD__%resources\"
for /r %parentfolder% %%g in (*.*) do (
  set "var=%%g"
  set var=!var:%parentfolder%=!
  set file=!var:\=\\! 
  set var=!var: =_!
  set var=!var:-=_!  
  set var=!var:\=_!  
  
  CALL :UpCase var
  @echo !var! RCDATA "resources\\!file!" >> resources.rc
)
GOTO:EOF

:LoCase
:: Subroutine to convert a variable VALUE to all lower case.
:: The argument for this subroutine is the variable NAME.
SET %~1=!%1:A=a!
SET %~1=!%1:B=b!
SET %~1=!%1:C=c!
SET %~1=!%1:D=d!
SET %~1=!%1:E=e!
SET %~1=!%1:F=f!
SET %~1=!%1:G=g!
SET %~1=!%1:H=h!
SET %~1=!%1:I=i!
SET %~1=!%1:J=j!
SET %~1=!%1:K=k!
SET %~1=!%1:L=l!
SET %~1=!%1:M=m!
SET %~1=!%1:N=n!
SET %~1=!%1:O=o!
SET %~1=!%1:P=p!
SET %~1=!%1:Q=q!
SET %~1=!%1:R=r!
SET %~1=!%1:S=s!
SET %~1=!%1:T=t!
SET %~1=!%1:U=u!
SET %~1=!%1:V=v!
SET %~1=!%1:W=w!
SET %~1=!%1:X=x!
SET %~1=!%1:Y=y!
SET %~1=!%1:Z=z!
GOTO:EOF

:UpCase
:: Subroutine to convert a variable VALUE to all upper case.
:: The argument for this subroutine is the variable NAME.
SET %~1=!%1:a=A!
SET %~1=!%1:b=B!
SET %~1=!%1:c=C!
SET %~1=!%1:d=D!
SET %~1=!%1:e=E!
SET %~1=!%1:f=F!
SET %~1=!%1:g=G!
SET %~1=!%1:h=H!
SET %~1=!%1:i=I!
SET %~1=!%1:j=J!
SET %~1=!%1:k=K!
SET %~1=!%1:l=L!
SET %~1=!%1:m=M!
SET %~1=!%1:n=N!
SET %~1=!%1:o=O!
SET %~1=!%1:p=P!
SET %~1=!%1:q=Q!
SET %~1=!%1:r=R!
SET %~1=!%1:s=S!
SET %~1=!%1:t=T!
SET %~1=!%1:u=U!
SET %~1=!%1:v=V!
SET %~1=!%1:w=W!
SET %~1=!%1:x=X!
SET %~1=!%1:y=Y!
SET %~1=!%1:z=Z!
GOTO:EOF