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Blogs

Technical notes from this site plus external writing on Qiita and Zenn.

Writing sources

Follow the same Windows, C#, and reverse engineering notes across platforms.

0x5BFA.dev

Long-form notes, app writeups, and reverse engineering deep dives hosted here.

Qiita

Japanese posts and quick technical notes on Windows, C#, C++, and reverse engineering.

Zenn

Books and articles for longer Japanese technical material.

0x5BFA.dev

June 10, 2026

How Font Folder View Works

Reverse engineering why C:\Windows\Fonts does not look like a normal Explorer folder, and how its font thumbnails are produced.

June 7, 2026

How Explorer resolves address bar input

Reverse engineering how Explorer turns typed address bar text like C:\Windows and shell:Downloads into PIDLs.

February 6, 2026

How pinning/unpinning a folder works

Deep dive into RE'ing the functionality of pinning a folder to Quick Access with IDA Pro.