Changing commas to periods and vice-versa in European currency denominations

I have a large table of values denominated in Euros. For some reason, Germans switch commas and decimal points (eg 700.000,00).

As a result, my American excel program on my American machine does not recognize the numbers properly. And as far as I know, I can only Find/Replace either the comma or the period, and do the other manually, because once I fix one, then for example, I'll have periods for both commas AAND decimal points. All of this also confuses the Format Cells: Number tab, making it impossible to address the issue there.

Is there a way to change the symbols without reconfiguring the settings on my entire system each time I want to do this?

Thanks in advance...

Run an Edit -> Replace as you say but as follows:

Run 1: replace . with nothing (see note)
Run 2: replace , with .

note: you don't need any delimiter in 700,000 ... XL will see 700000 as 700,000 automatically

OK, so there's no way to make the program recognize the decimals and commas as currency, and then reformat the currency denominations accordingly, without changing Windows settings?

My bad... I marked this "solved" prematurely... thanks for the help but I should have been more specific... I will use your proposed solution if that's all that's available, but see my previous post for a follow-up question.