no, ho detto una capperata.

dopo una ricerchina: http://filext.com/file-extension/PAR

ho tovato che sono Parity Volume Sets

Using parity volumes primarily allows one to recreate missing volumes from a set of files regardless of which file is missing and assuming that you have at least one parity volume for every missing file. Parity volumes are unique only to their specified file set. If the number of files missing exceeds the number of parity volumes it won't work
http://parchive.sourceforge.net/

Fluid.Studios.Software.Raid.Toolkit