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# Notes on file extensions
The Proxmark3 client uses a wide range of files. Here is a brief recap to get you up to speed.
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| extension | description|
|---|---|
| .exe | windows executable |
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| .bin | binary file, can be firmware or memory dump of a tag or keys dump of a tag|
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| .eml | text file, with memory dump of a tag (deprecated) |
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| .mfd | binary file, MIFARE file dump, name comes from NFC-Tools. Usually created with Mifare Classic Tool app (MCT) or NFC-Tools, contains memory dump of tag. Very similar to .bin file |
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| .json | JSON file, usually settings file or it can also be a memory dump of a tag |
| .dic | dictionary file. textual, with keys/passwords one line / key |
| .elf | binary proxmark3 device firmware file. |
| .cmd | text file, contains proxmark3 client commands used to call client with -s |
| .lua | text file, contains lua script to be run inside client. or called with -l |
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| .pm3 | text file, with numbers ranging 0-255 or -127 - 128. Contains trace signal data for low frequency tags (data load / data save) |
| .wav | binary file, PCM8 with samplerate 125000, one channel. (data save)
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| .trace | binary file, contains trace log data usually from high frequency tags. (trace load) |
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| .log | text file, our log file, contains the output from almost all commands you run inside Proxmark3 client |
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| .history | text file, our command log file, contains the commands you ran inside Proxmark3 client |
