If you can provide more context on the or the source where you saw it, I can help locate the correct download.
To find the correct file, I need to narrow down what it is. Could you please specify: Download Idora rar
The results point toward old newspaper archives, Touhou Project music database, or general archive search results. If you can provide more context on the
(e.g., Is it a game, an ebook, music, or something else?) Touhou Project music database