Setting up networking between Windows 98 and 10 is possible, but not trivial. You have to install an update (DSCLIENT, I think) that can be found on the Unnoficial Service Pack, change a registry key and match the user/password, remembering that Windows 98 has a limitation of 14 characters in user password. And it also adds a weird delay after the logon (almost 10 sec). FTP is A LOT simpler to set up. Install FileZilla server on the main machine, set a user, a password and a shared folder and now even DOS machines can access your shared files.

You appear to be behind a NAT router. Please configure the passive mode settings and forward a range of ports in your router. Warning: FTP over TLS is not enabled, users cannot securely log in

In my experience connecting my Windows 98 laptop to my Windows 8 desktop, the Windows 8 system can access the laptop with minimal effort but not vice versa. Given that, I just do any file operations necessary during the connection from Windows 8. :B

well, i was hopeing for a simple answer, i cant really do something like filezilla.

The whole NAT message is only relevant if you intend to access the server from outside your network (through the Internet). For an internal network, just ignore it. I get the message all the time. Enabling FTP over TLS also makes it more secure (I enabled it on my end), but also not required for operation. Basically:

1. Edit->Server
   1. General settings: I usually set "connection timeout" and "no transfer timeout" to 0... but not necessary
   2. FTP over TLS settings: Enable if you want, but you'll have to generate a certificate (there is a button for that) and set it as the "Private Key File" and "Certificate File"
2. Edit->Users
   1. General: Add a new user (no need to specify a group), then click on it to select it, check "Enable account" and "Password", then type the password. Click OK then reopen the window
   2. Shared Folders: add a new shared folder, then click on that folder on the shared folder list, then click on the user on the users list, then check at least the "read" permission for files and the "List" and "+Subdirs" permissions for directories. Also, click on "Set as home dir".

That should be it. Then on Windows 98 just create a shortcut to "ftp://name or IP of your main PC" and put it on your Desktop. It will ask for the username and password you set up in FileZilla.

like ftp://share?

No, the name of the PC or its IP address... more like
ftp://192.168.1.120
if the main PC's IP address is 192.168.1.120

i cant really sem to get acces to it stil, i did your setting recomended settings..

i think we need to do this next weekend.

oh... I think I know the problem.... Try disabling the firewall on the main machine. Turn it back on once you tested it, but if it works then you need to add an exception.

Hey it works.

Good? Try rearming the firewall then and following this steps (taken from FileZilla's wiki - and slightly corrected by me) with the Windows Firewall window open:
1. Click "Allow an app or feature through Windows Firewall" and a new button should appear titled "Allow another app..."
2. Click "Allow another app..."
3. A window titled "Add an app" should appear; do not do anything in this step.
4. Do NOT select "FileZilla Server Interface" from the list, instead click on "Browse..."
5. Locate the directory you installed FileZilla Server to (normally "C:\Program Files\FileZilla Server\")
6. Double click or select "FileZilla server.exe" and press open (Once again, NOT "FileZilla Server Interface.exe")
7. Your mouse pointer should now return to the "Add an app" window; scroll down the list and select "FileZilla server.exe" and click "Add".
8. Your mouse pointer should now return to the Windows Firewall Allowed apps window; verify that "FileZilla server.exe" is added to the allowed apps and features list and that it has a check mark in either the Private box or the Public box. Choose Private if you want the server accessible only from within your local network, and choose Public if you want the server accessible from outside your local network (this might include clients connected wirelessly to your network).
9. Press "Ok" to close the Windows Firewall window
10. Open a command prompt with administrative rights and execute the following command: netsh advfirewall set global StatefulFTP disable

I got green light from the commando prompt on the command request, now evreything works smooth and no problem.

Nic-93, I finally got around to test my home network again.

My DESKTOP-SERVER computer used to be on Windows 8.1, setup like in my YT video / guide you mentioned. I've upgraded it to Windows 10 and haven't used my Windows 98 PC since.

I setup a fresh copy of Windows 98 SE and it's working just like it did with Windows 8.1.

Im haveing troubel on this subject again, i cant acces at all, and i have made folder, username, giveing permissions.

Your windows 8 machine will be able to see and browse the win98 machine's shared files and folders, but not the other way around. As such, share a partition or folder on the win98 machine and set it to "full permissions" with read and write. Then, when you need to copy something to the win98 machine, use the windows 8 machine to access the shared drive / folder and copy whatever you need - nice and simple.