When using the Pose Editor on windows (not sure for other OS) when selecting the hand presets poses it will throw this error
# Error: ValueError: file ..../Maya_AnimationRiggingTools/MayaTools/General/Scripts\ART_poseEditor.py line 945: could not convert string to float #
So the workaround is:
Foreach *.txt files in …/Maya_AnimationRiggingTools\MayaTools\General\ART\Projects\Sample\Poses\Hand Poses you need to open it with a IDE (or some text editor that allow search-replace with regex) i will use Komodo Edit.
Then search and replace for the carriage return \r in REGEX mode and save the file
You will not see any change in file, but with this you can use the default pose editor hands poses.
Before and After
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