Format of CSV not correct?

Question

I am generating a CSV with EXPORT-CSV in Powershell and then feeding it to a Perl script. But Perl is unable to import the file.

I have verified the CSV-file against a working version (that has been exported from the same Perl-script and not powershell) and there are NO difference. The coloumns are excactly the same and they both have semicolon as delimiter. If I open the file in Excel however everything ends up in the first cell on each line (meaning I have to do a text-to-coloumns). The working file ends up in a different cells from the start..

To add to the confusion: when I open the file in notepad and copy/paste the contents to a new file the import works!

So, what am I missing? Are there "hidden" properties that I cannot spot with Notepad? Do I have to change the encoding-type?

Please help:)