HP-41 program cards: transfer to PC, magnetic format

How can I transfer programs from HP-41C program cards to PC?

I want to run them on the V41 emulator, without manually entering each program step. Once to the Windows XP PC in some known format, I can translate to what the emulator needs.

Has the format of magnetic information on HP program cards ever been made public?

Is there any known way to read the program cards without an HP card reader (such as with a credit card reader and knowledge of the magnetic encoding format)?

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