How to recover Accidentally setting up external harddisk as Time Machine (old data still neeeded)?

I accidentally select 'YES' when asked to setup Time Machine on an external hard drive, which I have data already on it original format (NTFS if I remember right).
I stopped the Time Machine before doing futher action like backup immediately.
Eject the harddisk drive.
Reconnect to Windows machine to see if I can still use the old data.  It is not recogniseable.  Using disk utility of Windows OS, I get this term on the said harddisk drive as "GPT protective partition 1397.26 GB".
It looks like the time machine "partitioning/formatting" of the hard drive.
How do I remove the GPT protective partition and possibly recover the old contents on the disk using some recovery tool either on MacOSX or Windows OS ?

All are named in FIFO new serialised generic filename.  That will be painful to reconstruct the new names again for all myriad files.
Try different ways to search for data - disk seek and search the entire device may find backup NTFS table and it will be possible to recover all or most of the files from the disk. Also note that the search results can be found .dmg partition equal to the size of your external drive - in this disk image may be the original file structure.
If the original structure of files can not be found - usually recover all the files that were not fragmenting into several fragments.
Regards,
Alex
Apple Support Professional

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