File 3C905B_3.EXE is disk 3 of 3 for the,

10/100 Fast EtherLink XL Adapter by 3Com
10/100 Fast EtherLink XL Adapter with Remote Wake-Up by 3Com

It contains diagnostics and configuration programs as well as some drivers for 16-bit operating systems. Some additional utilities available on diskette 3 are,
3C90XCFG.exe  - DOS Diagnostic Program
Autolink.exe - Automatically installs DOS Netware Client
Help.exe - Help menu
Install.exe - 3Com installation menu program
Readme.txt - Installation tips for the 3C905X Fast EtherLink Adapters
Roadmap.txt - list disks' contents

These adapters are marketed as Options By IBM and have been assigned IBM Part Numbers.
IBM P/N
IBM FRU # 
Description
3Com Part Number
34L0401
34L0409
10/100 Fast Etherlink XL Adapter by 3Com
3C905B-TX-NM
34L1001
34L1009
10/100 Fast EtherLink XL Adapter with Remote Wake-Up by 3Com
3C905B-TX