The FILES= setting needs to adjusted in every operating system released by Microsoft to date:
MS-DOS, WIN 3.1, WIN 95, WIN 98 (thru 2nd edition)
Edit CONFIG.SYS (create one if necessary in the root directory of each PC) to contain a FILES=150 statement. One way to edit CONFIG.SYS on Windows based systems is to click on start then run and then type SYSEDIT and click on OK.
The [386Enh] section of the SYSTEM.INI file needs to include the following line:
The file that you must edit is at C:\WINNT\SYSTEM32\CONFIG.NT. (Exception: for XP Home, the file is located at C:\WINDOWS\SYSTEM32\CONFIG.NT). Change the default of FILES=40 to FILES=150 (or if there is no FILES= statement, then add a FILES=150. Upon making this change, you do not need to re-boot, simply exit any running instances of Advanced Accounting and then re-enter the program.