Some information is available in emails from the Yahoo! Librie group [1] [2] [3].
A LRF file consists of a header, a number of objects and an object index. All values are in Intel (LSB first) order.
Header
| Offset (hex) | Size(bytes) | Name/meaning | Example value |
| 0 | 8 | LRF Signature | 4C 00 52 00 46 00 00 00 = "LRF" in Unicode |
| 8 | 2 | version? | 999 in most files |
| A | 2 | "Psuedo-Encryption" key byte | 48 |
| 0C | 4 | RootObjectID | 0x0044 |
| 10 | 8 | NumberOfObjects | 342 |
| 18 | 8 | ObjectIndexOffset | 0x00093440 |
| 20 | 4 | unknown | 0 |
| 24 | 1 | Flags (16 - back to front, 1 = front to back) | 16 |
| 25 | 1 | unknown (padding?) | 0 |
| 26 | 2 | unknown | 1600 |
| 28 | 2 | unknown (padding?) | 0 |
| 2A | 2 | Height? | 600 |
| 2C | 2 | Width? | 800 |
| 2E | 1 | unknown | 24 |
| 2F | 1 | unknown (padding?) | 0 |
| 30 | 0x14 | unknown | zeroes |
| 44 | 4 | Object ID of only PlaneStream (0x1E) object | 0x0042 |
| 48 | 4 | unknown | 0x1536 |
| 4C | 2 | XMLCompSize | 0x035C |
Next two fields are only present if version>=800.
| 4E | 2 | unknown | 0x0014 |
| 50 | 4 | GifSize | 0x03F2 |
Immediately follows the compressed XML metainfo, of size XMLCompSize. First dword of it is the size of uncompressed data, the rest is zlib compressed unicode XML.
If version>=800, the gif thumbnail follows, of size GifSize.
Object index
Offset to the index is specified by the ObjectIndexOffset in the header, and number of entries is NumberOfObjects.
Each index entry has the following layout:
| Offset (hex) | Size(bytes) | Name/meaning | Example value |
| 00 | 4 | id | 0x32 |
| 04 | 4 | offset | 0x07B0 |
| 08 | 4 | size | 0x44 |
| 0C | 4 | reserved? | 0 |
Objects
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