If XCOM for Windows is installed at the default location "C:\Program Files\CA\XCOM" and there is also a file with the name "Program" that exists directly under the C drive, the XCOM service fails to start.
C:\windows\system32>net start xcomdsrv
System error 193 has occurred.
*** is not a valid Win32 application.
XCOM for Windows
To resolve the problem, delete the Program file or move it to a different location. It can be located anywhere in subdirectories under the C: drive or on a different drive, but not directly under the C: drive.
This problem may not be limited to XCOM, but all applications under "C:\Program Files" will have this problem.