TTComp archive is a compressed file format. It was apparently used by some software installation utilities.
Though it may be called an "archive" format, it appears to store nothing more than a stream of compressed data.
The first byte of a TTComp file indicates the type of compression:
0x00: binary compression
0x01: ASCII compression
The second byte of a TTComp file specifies the size of the dictionary as follows:
0x04: 1024 bytes
0x05: 2048 bytes
0x06: 4096 bytes
Most TTComp files begin with bytes
0x00 0x06 indicating binary compression and a 4K dictionary.