little problem with INSTALL_DATA

[Serge Gagnon]

I try to copy some image data files with INSTALL_DATA but I got this error 
message:
install: /home/serge/work/Ports-work/Plan9/9maze/work/maze/images/: Inappropriate file type or format
*** Error code 71

I think that is because the filename are ended by .1 and INSTALL_DATA 
see a man page instead of data.
Am I right to think this ?
Do I just change their suffix, patch the code or it is an other way to 
install these files?

thanks
-- 
Serge Gagnon <ser_gagnon at sympatico.ca>
Quebec, Qc, Canada