How can i recover the deleted files?

No you can't

You can recover deleted files with asoftech data recovery software. get the software from link below

Voice Recorder Data Recovery Software

Please be noted that your voice recorder memory should show as a drive letter in your explorer, if not, you need to take out your memory card and connect using a card reader, or plug-in to card reader slot if there's any on your computer.

You may check out this memory card recovery tutorial also

You can connect your digital recorder to PC. Then you can try to recover your deleted files with Easy Drive Data Recovery software:

http://www.munsoft.com/EasyDriveDataRecovery/

It uses unique modern algorithms to recover files that other software either recovers incorrectly or is unable to detect.

YES, it is definitely possible to recover such kind of files deleted from your Olympus recorder.

First things first: DO NOT take any more videos or audio with the recorder that you want to recover files from in case you may quite possibly ruin your chances of voice memo file recovery.

Then connect your recorder to a PC with a recovery program installed. Photo Recovery Software (also recover Voice memos, audio and video files) is right what you need to use if you are running Windows. If you are Mac OS X users, turn to Data Recovery for Mac.

But you should remember - the more you use your recorder, the less likely you may be able to recover the deleted files back! So STOP using the device ASAP. I hope this will help. Best regards!

You may try asoftech data recovery which helped me before. You can download trial for free
http://www.asoftech.com/adr/

Please be noted that your voice recorder should show as a drive letter in your computer, if not, you need to take out your memory card and connect using a card reader, or plug-in to card reader slot if there's any on your computer.

You can recover deleted files with asoftech data recovery software. get the software from link below

Audio Recorder Recovery Software

Please be noted that your voice recorder memory should show as a drive letter in your explorer, if not, you need to take out your memory card and connect using a card reader, or plug-in to card reader slot if there's any on your computer.

You may check out this memory card recovery tutorial also

Yes, those voice recordings can be recovered provided not overwritten(if you keep taken more records, then possible). The best way is to try some audio recovery software. Here are some for your option. Both programs can also recover videos and photos.

Photo Audio Video Recovery Software (for Windows)
Mac Photo Audio Video Recovery Software (for Mac OS X)

Note: Before your audios are recovered, do not attempt to save more files.

When the Digital Wave Player application copies the files to yourcomputer, the default location is under My Documents>Digital WavePlayer>Message. There, you will see FolderA, FolderB, etc. +Recording & Schedule folders.

If the files are not there, use a file recovery application, such as PhotoRec to recover the deleted files.

Chances are there to recover such kind of deleted files from your Olympus recorder.

First things first: DO NOT take any more videos or audio with the recorder that you want to recover files from in case you may quite possibly ruin your chances of voice memo file recovery.

Then connect your device to a PC, and have a try of Photo Recovery (also recover audio, voice memos, video files etc), a data recovery program which is good at recovering media files lost. If you are Mac OS X users, turn to Data Recovery for Mac.

Lastly, I hope you good luck. Again you should remember - the more you use your recorder, the less likely you may be able to recover the deleted files back! So STOP using the device ASAP.

maybe, there are programs that retrieve deleted files, but sadly you need to buy them.

this only works if you havn't added any new voice recording (or a lot of voice recordings) or if you havn't reformatted your player.