BOM stand for Byte Order Mark. It is a sequence of characters, usually 0xfe 0xff, which are used to indicate the byte order (little endian -v- big endian) of the data in a unicode file. However, I can't see how the 2550 value relates.

See Byte Order Mark for some further info.

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In reply to Re: binmode file read error message by BrowserUk
in thread binmode file read error message by SamCG

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