[Kazun]

Примерно,так:

Код:

PS 62 >  gc 1.csv
1234 asdfadf 1
2314 asdfadf 5
PS 63 >  Import-Csv 1.csv -Delimiter " " -Header One,Two,Three | %{ "{0} {1:0000.000}" -f $_.One,[int]$_.Three}
1234 0001.000
2314 0005.000