First you must do a back up of save1.sii file yhat's located on 
"My Documents\18 WoS Convoy\save". You can do that by renaming the file to 
something like "Backup of save1.sii." or by moving it to a new folder. 
Open the file save1.sii with notepad or with wordpad and modify the line 
"money: xxxx". 

Write the amount of money that you want to get. You can edit this to any 
value desired to have that much money in your bank account.