Some ERI's aren't convertable

[exoticgirl6969]

I searched on Google, and noticed someone else had posted this problem.
Although there was no reply after the main author creater said something about checking out the problem.

Similarly, I have one whole folder with ERI (Entis Raster Image) format that was successfully converted, yet, another folder that can't be converted at all.

I have provided 3 convert-able eri, and 3 non convert-able eri files
http://www.fileserve.com/file/gV7pBaY/NConvert.7z

A bit of warning though, the 3 convertable eri's are adult content.

[xnview]

ok, i'll check

[exoticgirl6969]

ok, i'll check

Thanks.
Based on the file sizes, it also leads me to believe they are actually animated gifs.