| CURDIR() | Returns the current OS directory name. |
| DIRCHANGE() | Changes the directory |
| DIRREMOVE() | Attempt to remove an directory |
| DISKSPACE() | Get the amount of space available on a disk |
| FCLOSE() | Closes an open file |
| FCREATE() | Creates a file. |
| FERASE() | Erase a file from disk |
| FERROR() | Reports the error status of low-level file functions |
| FOPEN() | Open a file. |
| FREAD() | Reads a specified number of bytes from a file. |
| FREADSTR() | Reads a string from a file. |
| FSEEK() | Positions the file pointer in a file. |
| FWRITE() | Writes characters to a file. |
| HB_DISKSPACE() | Get the amount of space available on a disk |
| HB_FEOF() | Check for end-of-file. |
| ISDISK() | Verify if a drive is ready |
| MAKEDIR() | Create a new directory |