>>I am the clipper programmer and I want to try with visual foxpro now but I don't want to change all of my database files and also index files but I have some problem about the index files, can Visual Foxpro use the existing Clipper Index files ?
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>dBase index files - yes - Clipper NTX files - no. You will need to rebuild them in VFP. If you have a program in clipper that uses the xBase INDEX ON command - you can use that code in VFP to rebuild the indexes into a CDX file.

Can he use NTX and CDX together? Access and update at the same time a database with both a Foxpro app and a Clipper app?