I tried different combinations of [memorytype]=false in the DOSBox command line, but the amount of conventional memory did not increase, and the error message was the same (insufficient memory). I think there is no config.sys in Windows 7. Anyway I could not find it, and I don't know how to manipulate memory in Windows 7. Strange with this memory problem as the ctree program runs fine in a genuine DOS environment, also on my very old and small DOS computer. Do you know if the error code 8 means that it is the conventional memory which is too small?

8 means insufficient memory.
However in dosbox you have more conventional memory available than in real dos.

On my old Windows 98 computer the ctree progam runs fine. However, the computer uses some memory-definitions in its config sys, which you can also see with the DOS command MEM. I saved both as files, which I want to show you, because they could maybe be copied in DOSBox. However I don't know how to attach files to the present message. Could you please tell me? Thank you in advance!

Post the contents of your config.sys in the posting's text.

Here is the config.sys:

REM [Header]

REM [CD-ROM Drive]
rem device=c:\windows\command\toscdrom.sys

REM [Miscellaneous]

REM [Display]
device=c:\windows\himem.sys
device=c:\windows\emm386.exe x=C000-CFFF
rem N‘ste linie er indsat af Jens
files=80
device=c:\windows\COMMAND\display.sys con=(ega,,1)
Country=045,850,c:\windows\COMMAND\country.sys
DEVICE=c:\windows\Panning.SYS
rem DEVICE=C:\PRT4076C\BIDIDRVR.SYS

You should also have a print of the result of DOS command MEM (in Danish):

Hukommelsestype I alt Benyttet Ledig
---------------- -------- -------- --------
Konventionel 640K 94K 546K
vre 0K 0K 0K
Reserveret 0K 0K 0K
Udvidet (XMS) 64.320K 240K 64.080K
---------------- -------- -------- --------
Hukommelse i alt 64.960K 334K 64.626K

Under 1 MB 640K 94K 546K

Expanded (EMS) 63M (66.338.816 byte)
Ledig expanded (EMS) 16M (16.777.216 byte)

St›rste eksekverbare programst›rrelse 546K (558.688 byte)
St›rste ledige blok i ›vre hukommelse 0K (0 byte)
MS-DOS er resident i HIMEM-omr†det.

The above prints from config.sys and the MEM command are from my old Windows 98 computer, where ctree runs fine under DOS, as it does on my still older DOS-only computer. On my new Windows 7 computer there is apparently no config.sys file. Here DOSBox runs other oldies fine, but not ctree.

again do you really need to use lotus 123
lots of modern spreadsheets can import 123 files

TO THE MODERATOR OF THIS PAGE: It is a little confusing that the present discussion of how to run the program CTREE without error message "Insufficient memory" has "Lotus 1-2-3" in its title. Apparently the above comment from "Stavros" has been misled by this. Could the discussion be placed under another heading, so I could get relevant answers??

Your post regarding CTREE is HERE.