Problem opening mobi files with 6.1.3

I use dropbox to share word documents, PDF files, and custom ePub and mobi format ebooks.

With 6.1.3 it seems that mobi files are seen as rar format. So the kindle app does not open the files. There is a cumbersome workaround involving emailing the files.

The same problem also happens with skydrive so it is probably an ios issue not a dropbox issue. The kindle app still can open PDF files so one cannot point the finger at amazon.

I hope apple is aware of this and includes a fix in the next is update.

My phone is still on 6.1.2 and has no problem with mobi files.

I sure wish i could revert back to 6.1.2 but my understanding is that this cannot occur.