Where is the data located?
Receipts stores the data in a file ending in ". receipts". At the first program start Receipts asks where to create this file. Usually this is the "Documents" folder.
If the currently used file cannot be found, it is possible to display the file name in Receipts under the menu item "Display" > "Window title". There please press with the right mouse button, the path to the file opens. By selecting the next entry close to the file name, you can open the folder containing it.