It is the main tab to deal things about the file itself. The main ones being creating, opening, closing and saving files, and also printing files. You can also get information about the file and do other things like export the file.
Pick the Themes option on the Page Layout tab and then choose a theme that you want.
If you renamed an Excel file it would still be an Excel file, but Excel may not recognise it as such. It would be far better to open the file and then go to the File... Save As menu, select the file type as either Text (Tab-delimited) or csv (Comma Separated Values) give it a filename and click Save. You would then be able to open it in any text editor. Note that you can only save one worksheet, so if you had several worksheets you would have to save each one as a separate file.
With ThinkFree software on your Galaxy Tab, you open, view and edit Word, PowerPoint and Excel files without being tied to your desk. You can also view PDFs - handy for that restaurant menu or those directions you downloaded.
The developer tab allows you to write macros, run macros that you previously recorded, or create applications to use with Microsoft Office programs. It is a relatively advanced tab which you would likely benefit from reading up on before using. See the Excel help file for further information (click the help icon and search for "developer tab").
The default number of sheets in a new file is 3. This is a configurable option which is set from the Tools -> Options -> General tab. The maximum number of sheets is limited by the available memory on your computer. Info was from Excel 2003 Help "Excel specifications and limits"
active tab
The developer tab allows you to write macros, run macros that you previously recorded, or create applications to use with Microsoft Office programs. It is a relatively advanced tab which you would likely benefit from reading up on before using. See the Excel help file for further information (click the help icon and search for "developer tab").
To display the document panel in Microsoft Excel click the Menus tab, then click the file drop down menu, and there you will find the View Document Properties link.
in the home tab
Home Tab
It is on the Page Layout tab.