My mobile not show this file as unknown format.

Sounds like the partition table is screwed up. I've tried simulating it as best I could. I created a 25 MB drive in this video and edited the partition table to show only 2 KB. Formatting only allows me to format the 2KB in your case it would be 0KB and formatting won't do anything. Try the steps in the video.

china mobiles are using unknown properiatory OS it wont support any themes. There is no valid theme format for the china mobiles

Open your File Manage,
If you know the name of the virus then search every folder and file.If you found the virus try to delete it of if you cant delete it then format your MMC(If it is in your Memory card)
If you don't know the name of the virus then search all the files and folders.If there is any unknown file or file with unknown type or a file you didn't saved or put,then that is the virus!Try to delete it.
If you can't find it your self then try to format your phone.First try the soft reset then try other methods.
Soft reset :*#7780# (*#rst0*) - This will soft reset your phone. It is different from *#7370# because all data, like contacts, calendar and notes, are not removed.
It will only reset the phone settings, such as profiles, themes and shortcuts.
The default lock code is 12345.(Read Method 3)
or try this(But it will fully format your phone)
Method 1:
Three Finger Reset for Nokia Phone
1. Switch off your Phone.
2. Hold down the following three keys, Green (call answer button) * (Star) Key, and Number '3' key.
3. While holding The Three buttons, press the power button for switch on the phone.
4. Wait for the message 'Formatting' to the screen On Your Mobile and release all keys when you see that message.


Method 2:
Hard Format of Nokia Mobile Phone
1. Switch off your Phone
2. Now Press following key-*#7370#
3. Enter Default lock code is 12345.
4. While holding All of the buttons, press the power button for switch on the phone.
5. Wait for the message 'Formatting' to the screen On Your Mobile and release all keys when you see that message.

Method 3:
Soft Reset of Nokia Mobile Phone
1. Switch off your Nokia phone
2. Now Press following key sequence *#7780#
3. Enter Default lock code is 12345.
4. While holding All of the buttons, press the power button for switch on the phone.
5. Wait for the message 'Formatting' to the screen On Your Mobile and release all keys when you see that message.

Please Note:
The formatting method will erase all of your Phone data.
Please take a backup before you Format.

by pressing Calling key and 3 and * and switch it on ur battery must be charged it will show formatting for 5 minutes and it is done. dont remember to vote my solution as fixya

Your pendrive is infected with Autorun.inf virus
to remove this virus install malwarebytes (It is antimalware software)and scan your whole computer as well as your pendrive when you scaning finish remove all threats

the jar format software u will install in ur computer

Sir,

Pl solved the following problem my mobile - LG Model No. LG RD 2230.

def heap-free : free\defheap.c 123

Thanks

If there are such unknown folders and files in your pen drive and you did not place them there, then you have reasons to be cautious. Try to run a virus scan, these night be trojans or worms, etc. or copy/backup the important files in your pen drive then, format your pendrive.

Its the hidden system files of xp ... hope u have copied it to the phone i guess ... format the card and rest the phone once ...

it is unknown file format because the format of the music is most likely in mp3.

the panasonic x700 will NOT play songs in mp3 format.