At this time we have no plans to add 32-bit support for Windows. I'm filing this bug as a cleaner place to track this request (e.g. upvote if you want this) as well as the blocking issues were someone to want to add support in the future.

We have several other existing 32-bit windows bugs, all of which are closed, e.g. #22638 #21169 #14925

As originally captured in #14925 (comment), blockers are at least:

1. flutter/engine has no 32-bit build rules currently, including gen_snapshot
2. gen_snapshot is architecture dependent, unclear if a 32-bit gen_snapshot could build for 64-bit Android (which is a requirement for the Play Store as of this August).

Steam stats show 32-bit Windows as less than 2% market share:
https://store.steampowered.com/hwsurvey

Given the low market share numbers and other vendors dropping support for 32-bit, it seems highly unlikely we'd add 32-bit Windows development support for Flutter.

I welcome thoughts from others, or additional/new data as to why we should add 32-bit development support?