Can not open file from diskette!!!!

I would try cleaning the drive make sure it free of dust ect and try another disk to make sure it reads. If it works fine the its the disk try disk on another machine. Even brand new disks can be faulty.
Good luck

To expound on the above:

I have had numerous problems with floppy disks over the last several years. Seems that quality of both diskettes and drives has deteriorated.

It appears that file copies correctly, but it can't be read in another drive and sometimes in the same drive used for copying.

Head alignment will vary from drive to drive exacerbating the problem.

See if you can read the disk in drive used for copying. If it doesn't read there, probably won't read at all.

Recommend using USB key drives in lieu of floppy disks whenever possible.

1. Verify that you dont have a virus on the disk and on your system first.
2. check canle and power connections.
3. If the floppy is a internal floppy drive with the case making the the front of the drive, check and see if the floppy is inserted all the way into the drive unit.
4 If all above is OK replace drive (only $11)

IT IS PROBABLY SHOT - BUT
TRY THIS
open my computer
Right click on the floppy and choose
Properties/tools
scandisk

Can you open a file on a different diskette.
If you can open a file on anther diskette then there is a problem with the diskette.
Does the light on the floppy drive flash when the computer is booting up showing that it is working? If it doesn't then there is no power getting to the FDD.
You commonly get this message about formatting when there is no power supply to the floppy disk drive.
If you open the computer up you can check that the FDD is pluged in. Try unpluging it and re-pluging it in.
If it is pluged in and still doesn't go then you either have a faulty FDD or a faulty power supply.
Try another power supply.
Try another FDD.