Readonly documents

```
What steps will reproduce the problem?
1.create readonly document
2.try to open the document
3.

What is the expected output? What do you see instead?
I know i can read other documents in the same location but this is
the only one not able to open

this is the output i receive: The filename x.xls is not readable

Please provide any additional information below.

```

Original issue reported on code.google.com by `enya...@gmail.com` on 10 Mar 2011 at 6:43

Start by reproducing the reported case with a readonly .xls document, then compare it with another readable document in the same location. No source file or test is named in the issue, so locate the reader entry point and existing tests before investigating. Done means the readonly document opens without the reported “not readable” error.

Written by the indexing model from the issue text.