Detecting an ASCII text file

Is there any way to detect that a file that Delphi has opened for input and is reading, is an ASCII text file? In other words, if the user tries to open a ZIP file or a binary executable file, is there a way to detect that this file is not ASCII and flash an error?
  I know you can set file masks and all that in the Open Dialog box, but is there a way I can check the input files content programmatically and sound an alarm if it's not readable ASCII text?

Thanks,
  Shawn Halfpenny
  drumme59@sprint.ca
aztecAsked:
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ahalyaCommented:
yes. if you're willing to open the file and examine it yourself.

open the file and as file of byte
repeat
 read(nextbyte)
 binary := ((nextbyte) > 126 or (nextbyte) > 32)
until binary or eof(file)

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ahalyaCommented:
Well, what about tabs, CR-s, LF-s, EOF, etc?

Also this code is a bit slow, some buffering would be better.
Or memory mapped files if win32 is used.
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