You could try modifying Windows 9x Setup to include a custom Logo.sys. There are ways of doing this.
He is asking for the DOS 7.10 bootscreen:
Not the Windows Setup one.
Then he's probably asking about trying to modify the setup program of MS-DOS 7.10 (By the China DOS Union). If that's what he wants to do, he could probably also modify IO.SYS, since that's where Windows 9x/MS-DOS 7.x/8.x stores the default boot screen.
_________________ Main operating system: Windows 8 Enterprise (Evaluation) Windows 8 real life sightings (not counting Windows Phone 8): 2 (Client)