I want to schedule a program to run every day, but I can't get the AT command to work (using Windows NT 4.0)

I tried as a test:

AT 9:00 \\ServerName\DriveName\MyProgram

At 9:00 I see a quick flash, but the program didn't run properly (it create a new file, which doesn't exist after the test).

I tried also:

AT 9:00 "\\ServerName\DriveName\MyProgram"
AT 9:00 \\ServerName\DriveName\MyProgram.EXE
AT 9:00 "\\ServerName\DriveName\MyProgram.EXE"
AT 9:00 MyBatch.BAT (batch file that start my application)

But everyone of these fails. The only one I got to work is:

AT 9:00 WinMine (or other Windows program)

The application work fine if I start it from Explorer or by the run command, but fail everytime I use the AT command.

TIA