Certainly, you are correct that a directory will be created instead of a file. The proper approach in general is to check the external file attribute field. Although this field might be set to zero if a file came from a standard input (and it was zero in my case). So I found the above solution to be an acceptable compromise. After all, I was not making ultimate software: Zipofig was just a quick hack to recover my data :)

Watch out:

if ( (Y==0) and (original size from central directory entry==0) and (crc32 from central directory entry==0)) then make directory (S)

If you have any zero-length files in the archive, this will create a directory where a file should be.

I’m not sure what the accepted solution is, but I’m currently checking to see if the entry name ends in a slash character (which seems to be a common convention). For unix, the info-zip extensions may store the D bit as well, but I haven’t looked into it that far yet.