Hi,
Export and Import are in CSV format.
There is an hidden configuration option which allow to export in XLS format but the import only works with CSV.
CSV is "Comma-separated values", when you open the file with Microsoft Excels or Open-Office, you have to choose the "semi colon" separator ( ; ).
Some version of Excels use the comma "," but, even if it was the base of the format, semi colon would not generate problem with prices.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.