<p>Looking at the size and doing a few tests suggests it might be due to us still using signed 32 bits integers for holding positions and alike.  Maybe even in Scintilla, that might require a specific define to use 64bits positions.<br>
This would mean trouble when the file size is greater than <code>(1 << 31) - 1</code>, which your file definitely is.  I'll try and dig a little more,  but it might be far from trivial to fix ATM <g-emoji class="g-emoji" alias="confused" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f615.png">😕</g-emoji></p>

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