Opening Certain Files Internally ... Again

[tfjern]

I've carefully read the "help" file, searched the forums, but still couldn't get the following to work:

I would like to open internally pdf and Excel files.

Word 2007 files open internally just fine, but not pdf (Adobe Reader 9) and Excel 2007 files. When I try to I get this message: "Click here to open linked document." If I click there, the file opens externally.

And yes, in Tools | Options | Documents | "File extensions to open stored documents writeable" I inserted (...) .doc;.docx;.xls;.xlsx;.pdf (...).

And also yes, in Tools | Options | Browser | "File extensions to display in internal browser view" I inserted (...) .doc;.docx;.xls;.xlsx;.pdf (...).

Any suggestions as to what I'm doing wrong? The answer is probably right there, staying me in the face.