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When files are created by REBOL, default access permissions are set. On Windows and Macintosh systems files are created with full access privileges. On UNIX systems files are created with the permissions set to the current umask setting.
To make a file read only, use open/allow, or write/allow with a read block.
write/allow %file.txt [read]
To make a file readable and executable:
open/allow %file.txt [read execute]
You can set similar permissions for write access:
write/allow %file.txt [read write]
To prevent any access to a file (for operating systems where this would make a difference) provide an empty permissions block:
write/allow %file.txt 
To permit full access:
write/allow %file [read write execute]
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