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Total Commander is a cool utility that's more robust than File Explorer. It's also FREE.

Just click the link below and your MDA will ask you if you want to open it when it downloads, you can say "Yes". It'll then prompt you asking if it's safe to. Say "Yes". It then installs the CAB file and voila! It's now installed and can be accessed throught the PROGRAMS folder.

Happy Filing!

Total Commander Download

From their website:

Download version 2.0 of Total Commander for Pocket PC
What's new in 2.0 (June 21, 2005):

Support for portrait/landscape switching
Save column widths in full view
FTP client, registry editor, and access to LAN (local area network)
Requirements:

A Pocket PC or Pocket PC phone device: The text "PocketPC" or "Windows-Powered" should be on the device!
The supported processors are: ARM, XSCALE, MIPS, SH3
A Windows PC with installed ActiveSync >=3.x (for installing from a Mac, see below)
A version for other Windows CE devices is available separately
This program does NOT work on a Palm, Clié or Epoc system!
Main features: (screenshots)

Copy, Move whole subdirs
Inplace rename, create dirs
Delete (no recycle bin)
Zip and unzip
Properties dialog, change attributes
Built-in text editor
Search function (also for text)
Select/unselect groups of files
Select with [Sel] button
FTP client
Registry editor
LAN access
Send/Receive via Infrared (OBEX)
Brief, full and large icons mode
Single or two file window mode
Option to hide all files in ROM
Directory hotlist as in Total Commander
Directory history through dropdown list
Tree view
Configurable button bar
Simple help function
Supported languages: English, German, Catalan, Czech, Danish, Dutch, French, Hungarian, Italian, Polish, Russian, Simplified Chinese, Spanish and Swedish