FAQ.How to read the command line on windows?
Feedback.

Answer: Try this code:
Example:

#if targetwin32 then
  dim line as string
  Dim mem as MemoryBlock
  
  Declare Function GetCommandLineA Lib "kernel32" () As Ptr
  
  mem=GetCommandLineA()
  s=mem.cstring(0)
  
#endif

Notes: Newer Realbasic versions have a system.commandline property.