Desktop app to split CSV file's based on contents of a column

Would like to load a csv file and have the application process it, splitting it up into separate files based on a given column. Example... File starts as: [login to view URL] a, red, 18, knitted, spanish a, red, 5, quilted, english a, blue, 14, mesh, japanese a, green, 3, leather, greek b, red, 18, knitted, spanish b, red, 5, quilted, english b, blue, 14, mesh, japanese b, green, 3, leather, greek c, red, 18, knitted, spanish c, red, 5, quilted, english c, blue, 14, mesh, japanese c, green, 3, leather, greek d, red, 18, knitted, spanish d, red, 5, quilted, english d, blue, 14, mesh, japanese d, green, 3, leather, greek And is exported as [login to view URL] a, red, 18, knitted, spanish a, red, 5, quilted, english a, blue, 14, mesh, japanese a, green, 3, leather, greek [login to view URL] b, red, 18, knitted, spanish b, red, 5, quilted, english b, blue, 14, mesh, japanese b, green, 3, leather, greek [login to view URL] c, red, 18, knitted, spanish c, red, 5, quilted, english c, blue, 14, mesh, japanese c, green, 3, leather, greek [login to view URL] d, red, 18, knitted, spanish d, red, 5, quilted, english d, blue, 14, mesh, japanese d, green, 3, leather, greek Also to be included in the file name is the number of lines in that specific file. Browse button to load file, 'preview' the first row of the file with a drop down or something similar to select which column to cut the file by. The original file shall remain un-modified, and the application should be able to handle 1 mil record csv files.