Quick spec questions & app silent crash

I compiled a script that sends a file to a richedit the file content but the app simply exites silently  when my file was just a few MB large.

So I have a few questions about the things invoved that I used

• FileOpen Any mem/disk size limit?
  
• FileRead Same, Size limit? how about the variable that holds it? 2GB?
  
• local $txt =FileRead($hfile) -  local $txt: Size limit for 32bit? Size limit for 64 bit?
  
• global $gtxt =FileRead($hfile) -  local $gtxt: Size limit for 32bit? Size limit for 64 bit?
  
• richedit Size limit to add, to set, to insert, to whole content?
  
• local $arr[N] - N limit? arr[] limit (mem)?
  
• global $garr[N] - N limit? garr[] limit (mem)?
  
• Can Compile Script to exe compile to 64 bits? even if the compiler is 32 bits?

To fix the crash I read the file line by line.  but I cannot keep the whole file in memory, $filebuff += ReadLine()... crash at about 1.5 megs

Thanks!