When importing into Excel, you have to select the same delimiters as the exporting application used. In other words, if View Studio uses commas, you have to set Excel to use commas as well.
When you save the file back into csv format, formatting is stripped away, including column width, color, etc. It's always good to double check with a simple text editor before and after. Notepad in Windows is good for that. I use Notepad++ as well. A csv file is a plain text file, so you need a plain text editor to make sure Excel didn't add (or remove) characters. For example, a leading single quote tells Excel something (leave the rest of the text in the cell as-is instead of applying a number or date format to it) and it sometimes inserts an extra one or removes a necessary one.