Selecting Delete Old Files from the File menu will open a window showing the recommended files to delete. iBid will save three months of bid data. These are the previous month, the current month and the next month. This data will be saved for each position (Capt/FO) and domicile that you have downloaded.
If you want to keep any of the files recommended for deletion, double click on the data you want to keep and it will be removed from the Delete Old Files window. Only files listed in the Delete Old Files window will be deleted.
The files ending in ".737" contain bid data and the WBidDatFiles contain hotel data.