Few times ago I need a good portable version of multiformat e-book reader.
As I make chromium browser builds, I think it’s good that it would be based on chromium sources.
And found it on [github] – Koodo Reader.
Now I test new version 1.4.5 and found it very good in progress, now it’s show amount of pages (for example, you are reading 12 of 75), and finally correctly open most of cbr and cbz comic books formats (still have some problem with cbz files with more than 250Mb).
Koodo Reader also support a lot of formats: epub, fb2, pdf, djvu, txt, docx, rtf, md, mobi, azw3, html (htm, xhtml), xml, cbz, cbt, cbr.
Also it has touch screen support, good to use on windows tablet PC.
You can download my Koodo Reader Portable build for Windows [here]