Naming Conventions
Naming conventions for non-common files:
| Filename: | bytes 1 - 6 | Supplier Id |
| bytes 7 - 8 | File type code (See below for list) | |
| File extension: | byte 1 | A letter code indicating effective month of file. A=January, B=February, etc. |
| bytes 2 - 3 | Effective day of month (numeric) |