Edo made excellent application for Epoc32 Psion PDAs. It is called FileNote.

FileNote

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Two panel file manager
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Fully scallable design, works on big and small screens.
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Various coulour schemes, user definable
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Black colour scheme
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Text viewer can handle plain text, opl source code...
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Scalable fonts on text viewer
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Hex viewer
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Disk browser, see option to browse all email attachements!
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Look on the Menu structure
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Macros! Very similar to macro5 with full control over FileNote.
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Settings dialog

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