I found out earlier. Magento can export to a CSV though. Is that supported?
Also what about the picture size?
Hello. To use CSV import/export go to Admin-System-Data-Import & Export
Picture sizes depending on your settings in admin see Admin-System-Settings-Appearance Tab
Please follow the Import & Export manual link provided. You can not just export from Magento and import to AbanteCart because .csv file format doesn't mean same data and structure. After You export from Magento open csv file and copy required data to AbanteCart .csv file (products name, descriptions etc)
The best way to get AbanteCart scv file example - try to export from AbanteCart admin or use example files attached to the Import & Export manual