Low-level SD(HC) card editor/formatter? (how to delete dirs with illegal names)

[tichi]

Hello guys,
I want to get rid of some accidentally produced folders with
"illegal names" on my SDHC 4GB card..
(the system is WM6 on Touch)

While unpacking some archive with accented file names,
pocketRAR produced for me several folders with gibberish names,
and weird dates, which I cannot delete neither with pocketRAR itself, nor with Total Commander, nor with File Explorer..

Does not anyone happen to know a software to deal with such situations
(preferably without reformatting the SDHC card)?

If not,
are there any SDHC formattting tools for WM6?
(my laptop cannot read SDHC cards)


Thanks in advance, Tichi