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Could you please provide the

Could you please provide the sample file that is handled wrong in 32-bit mode? Use for that :)

On Nov 26, 2021 we fixed one 32-bit related error via this commit:
Probably it will fix the issue but we need sample file to be sure.

If your LibRaw is older consider upgrade via github (or just apply this patch)

The easiest way to build 32-bit LibRaw for windows is
1) start Visual Studio developer shell in 32 bit mode
(e.g: run cmd.exe and execute
call "C:\Program Files ... path to VisualStudio installation...\VC\vcvarsall.bat" x86
2) run nmake -f Makefile.msvc to build LibRaw

32-bit windows (and even more broadly, 32-bit apps) don't look relevant in 2022, nevertheless, it is still too early to completely stop 32-bit systems support.

-- Alex Tutubalin @LibRaw LLC