Although some GIS applications support using E00 files directly you will likely find it more efficient to convert them to another format. This can be easily done with ogr2ogr.
Suppose you want to extract features from a vector layer to create a smaller subset. This can be very handy if you have a large dataset and need just a portion of it for your current project. If your data happens to be in one of the formats supported by OGR, you can use ogr2ogr [...]