how to retrieve my deleted files? undel utility doesn't work

I deleted my project directory in QNX… Could any of you please tell me how
to retrieve my working directory.
I tried downloading undel.gz from /usr/free/qnx4/os/utils/disk/, but it
gives me
“Expected )”. I could not find a readme file with that.

Any help in this regard, will save from me from lot of re-doing tasks.

Thanks - Jalaja