Working with Interchange Files (*.e00 files)
Many agencies provide GIS data as interchange files (*.e00). This is because all features and their related files can be compressed into one file. To use the data, you will need to convert the file to a coverage file.
ArcCatalog > View > Toolbars > ArcView 8x Tools
Conversion Tools > Import from Interchange File > Browse to *.e00 file > name the output file (usually want to keep it similar) > OK