Every application handles EPS vectors a bit differently and on many occasions I have seen with both Flexi and CorelDRAW an inability to open its own EPS exports. As a long time publisher of vector clipart in EPS format, I can tell you that we always open any EPS created in any other program with Adobe Illustrator and, after inspection, resave it as EPS from Illustrator.
We have never had a complaint in 23 years of following this practice.
If you don't have a license for Adobe Illustrator, get one and you will fix your problem.