Change default to save documents to storage card
By default, Pocket PCs save Notes, Word, Excel, and other documents to the "My Documents" folder in main memory. In most Pocket PCs this is located in RAM, but in the new Windows Mobile 5.0 devices it will be in "Persistent Storage" (flash ROM). If you prefer to store your documents on a storage card, you can change the defaults in each application to do so. You change this default setting in the Options menu. For example, here's how you do it in Pocket Word. The process is similar in other applications.
Open Word on your Pocket PC.
Tap on "Menus," select "Tools," then "Options." (On pre-Windows Mobile 5.0 devices select "Tools" and the "Options.") By default, the window labeled "Save to" will indicate that you are saving documents to "Main memory."
In the "Save to:" pull down menu select "SD Card" or "CF Card." (You must have a storage card in the slot or these options will not appear.)
Tap on "OK."

You can configure Word and other applications to save their documents directly to a storage card, instead of the default main memory.
Now, when you save a Word document, the Pocket PC will automatically save it in the "My Documents" folder of the storage card you selected. If the storage card does not have a "My Documents" folder, create one. Do this using File Explorer and make sure it is two words separated by a blank space (not a dash or underscore character).
The steps above do not change the location of files you've already saved to main memory. You'll need to use File Explorer to move those files to the "My Documents" folder on the storage card. Final note: You cannot set things up to automatically save documents to a sub-folder of My Documents. If you want to do this, you have to use File Explorer to move the document after you have saved it. Documents in sub-folders of My Documents will show up in the applications file list.
Note: ActiveSync has a feature that lets you sync files placed in the My Documents folder with those in a similar folder on your PC. If you change the "Save to" settings in Word (or another application) so that you save documents to the My Documents folder on a storage card, you cannot automatically sync those files with your PC. You must use the File Explorer to copy them to your PC. Only files stored in My Documents in main memory can be synchronized.
Viewing file extensions on the Pocket PC
A file extension is the set of three letters that come after the period in a file name, and tell you what type of file you're dealing with. For example, the file extension in FILENAME.DOC tells you that it is a document file for Word or another word processing program. The extension in FILENAME.EXE tells you that it is an "executable" file for a program. For example, PocketTV.exe is the main program file for the MPEG video player Pocket TV.
The File Explorer program built into the Pocket PC does not display file extensions. Instead, it displays an icon indicating the type of file you are dealing with. This is fine for most file types, but you may occasionally run into a file type that File Explorer does not recognize. In that case File Explorer will display a generic icon indicating that it does not recognize the file type. There are two ways to see the file extension.
The first way is to view your Pocket PC files from your desktop PC.