Notes on file extensions

The Proxmark3 client uses a wide range of files. Here is a brief recap to get you up to speed.

.exe windows executable
.bin binary file, can be firmware or memory dump of a tag
.eml text file, with memory dump of a tag
.mfd binary file, usually created with Mifare Classic Tool app (MCT), contains memory dump of tag. Very similar to .bin file
.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
.pm3 text file, with numbers ranging 0-255 or -127 - 128. Contains trace signal data for low frequency tags (data load)
.trace binary file, contains trace log data usually from high frequency tags. (hw trace load)