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What is this file in my root directory?

I have a very large file in my root directory I am wondering If can delete.
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NO DO NOT DELETE. That is your swap file for windows. When windows doesn't have enough memory to store the programs it is trying to run, it uses disk space as memory. That file is the disk space windows is using.
Robinet, you can delete this file, but not while your in windows as joed notes.

This is your swap file as joed notes, however you can get some system performance by deleting this from a dos prompt and then run a defrag of the system. You will see some improved performance.
Windows 98 uses a special file on your hard disk called a virtual-memory swap file (or paging file). With virtual memory under Windows 98, some of the program code and other information are kept in RAM while other information is swapped temporarily to virtual memory. When that information is required again, Windows 98 pulls it back into RAM and, if necessary, swaps other information to virtual memory. This activity is invisible, although you might notice that your hard disk is working. The resulting benefit is that you can run more programs at one time than the computer’s RAM would usually allow.
The Windows 98 swap file is dynamic, so it can shrink or grow based on the operations performed on the system and based on available disk space. A dynamic swap file is usually the most efficient use of resources. The swap file can also occupy a fragmented region of the hard disk with no substantial performance penalty.

Tip for Swap File Performance
The single best way you can ensure high swap file performance is to make sure that the disk containing the swap file has ample free space so that the swap file size can shrink and grow as needed.

The Windows 98 swap file (WIN386.SWP) is not a permanent file. However, Windows 98 can also use a permanent swap file.
Although the system defaults usually provide the best performance, you can adjust the parameters used to define the swap file. For example, to optimize swap file performance on a computer with multiple hard disk drives, you might want to override the default location of the Windows 98 swap file. The swap file should be placed on the drive with the fastest performance (unless that disk is overused). If a user usually loads all software from the same drive in a computer that has multiple drives, performance might be boosted by placing the swap file on one of the drives that is not as busy.

Caution: Completely disabling virtual memory might cause the computer to stop operating properly. You might not be able to restart the computer, or system performance might be degraded. Do not disable virtual memory unless instructed to do so by a technical support representative.

To adjust the virtual memory swap file

1. In the System option in Control Panel, click the Performance tab.

2. Click the Virtual Memory button.

3. To specify a different hard disk, click the option named Let Me Specify My Own Virtual Memory Settings. Then specify the new disk in the Hard Disk box. Or, type values (in kilobytes) in the Minimum or Maximum boxes. Then click OK.

If you set the maximum swap file size in the Virtual Memory dialog box to the amount of free space currently on a drive, Windows 98 assumes that it can increase the swap file beyond that size if more free disk space becomes available. If you want to impose a fixed limit on the swap file size, make sure that the limit you choose is less than the current maximum

That is what the file is so the choice is yours. By default Windows 98 handles it but you can set it for yourself if you want. By changing the setting it will delete itself from where you see it but Windows will recreate it. You paid a hundred points so there is the whole scoop.
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