From Macros Wiki
- FILE_EXISTS <filename>, <status>
check to see if a file exists.
- Filename as either text in double quotes, or a text variable.
- If the filename does not contain full path information, then the file will be opened in the same folder as the macro.
- Variable to set to the file status. 1 if the file exists, 0 if it does not.
- FILE_EXISTS "MyFile.txt", MyVar