Several useful extensions to the file explorer are missing on the PocketPC when compared to the desktop version. OpenWith adds a context menu when you tap and hold on a file that when selected allows you to choose a different application to launch a document with.
How to use
Tap and hold on any file in File Explorer, and choose "Open [FILENAME] with..." from the menu. Select a previously used application for this extension from the drop down list, or type or browse to a new program to execute.
Arbitrarily complicated command lines are supported. Usually just the program name should be sufficient, however if the application needs command line switches, you can edit them in. The text %1 will get replaced by the selected filename, otherwise the filename will be added at the end of the command.]
NOTE: make sure the program name has quotation marks around it if there are any spaces in the path to the program. It's best to always keep them there.
SendTo (Coming Soon!) adds a menu item to send the file to a different location without having to cut and paste.