anything to do when missing the .par index file?

[vexexer]

I've found too often lately that all the files in the parity set are posted, vol000-001.par2, vol002-004.par2, etc, EXCEPT the .par index file
I can open one of these files, but it appears that ONLY that one file is being used to rebuild any missing parts.  Which can help, if only missing a small amount of data, but doesn't help if missing a larger amount.
Can this one .par file be 're-built' so that the quickpar program knows to use ALL of the parity set files? 

thanks
vex

[jaapf]

Unless the poster has done something very weird there is no need for te small par2 file other than having a quick verification file without downloading other par2 files. All par2 volumes should be used if you open any of the volumes.