File "C905CTD.EXE" is the 3 COM DynamicAcess version 3.0 software, optional program, supporting DMI 2.0s for Windows 9X and Windows NT. To be used with 3Com's 3C905C-TX and 3C905C-TX-M adapters. This disk and files are not required to install these adapters. This disk does no contain NIC drivers. These files are compressed from the original 3 Com  DynamicAcess diskette. When this file is executed it will extra the all files. There are 2 files on the original. These adapters are listed in IBM's OBI CTO Portfolio and have IBM part numbers assigned. 
3C905C-TX  =  IBM P/N 01N0533 with an IBM FRU number of 01N0535.   
3C905C-TX-M  =  IBM P/N 01N3699 with an IBM FRU number of 01N3609.