Or put them in the Axim_Name My Documents Folder created when you first synced the Axim to the PC. It will be converted and placed in your Axim's My Document Folder next time you Sync with Files Selected.
You can also Save Workbook As Excel 97/2000, instead of as Pocket Excel (on your Axim). The file will take up a bit more space, but you seem to lose less, too.
(or at least that's the way I do it and perhaps have just come accustomed to the limitations, been doing it this way for 4 years........same worksheet w/minor mods).
