[Q] Browing/extracting from Android recovery userdata_YYYYMMDD_HHMMSS.backup topic

I've got a Memo pad 7HD (ME173X) that won't boot (circling dots after the ASUS boot logo)
So I've come to the conclusion I'll try to factory reset / full flash (sp_tool).

I've successfully make a backup using the stock recovery <3e> and I got a userdata_YYYYMMDD_HHMMSS.backup file. (I did it twice to ensure the file was OK ok the flash)
Now before going the hard way, I'd like to check this backup ! Any clue on how to do so ?

FYI, some details about what I've tried do far: http://forum.xda-developers.com/show...89&postcount=9