how to read doble with many decimal number

Hi All,

Im having a problem reading a txt file with columns with many decimals like:

1012,11849192100538599640933572710951526

1254317344,9135262808395419296644329833366117

2,5511215309461322093666347767315641174

32864,9216687364989887326508181459877826

As you can see is a problem because I can handle with this numbers as double… and if I load as string and after try to change to number is not recogniced and get a error.

I really need your help, please.