Length fields after MZ

[marekm72]

I haven't used MS-DOS for about 30 years but still remember a little from the old days... Just curious how it works on DOS since the next three 16-bit words after MZ signature are number of bytes in the last 512-byte page, number of 512-byte pages, and number of relocation items - so anything printable ASCII in there like "MZqFpD='" would be interpreted as large out-of-range values. Or are these header fields actually ignored by DOS and that's why it works? Might be good to mention that in the FAQ.