Win3.1 provides functions for application install programs to compress and decompress their files. These are provided in the 32-bit API as well.
These functions include:
| Function | Description |
| CopyLZFile | Copies a file, decompressing if necessary. |
| GetExpandedName | Retrieves the original name of a compressed file. |
| LZClose | Closes a file opened with LZOpenFile. |
| LZCopy | Copies a compressed file. |
| LZDone | Frees buffers allocated by LZStart. |
| LZInit | Allocates structures for file compression. |
| LZOpenFile | Opens a file. |
| LZRead | Reads from a compressed file. |
| LZSeek | Seeks in a compressed file. |
| LZStart | Allocates buffers for CopyLZFile. |