If you run M$ Office Access on Citrix the import file types like .xls can be missing.

It may be solved by installing M$ Office using „Software→add Program“ if this way doesn't help use the following .reg files to solve this problem:

Usage:
You should look for following files in your system:
msexcl40.dll, msrd2x40.dll, msrd3x40.dll, msltus40.dll, mspbde40.dll, msjspp40.dll, mstext40.dll, msxbde40.dll

Normally they are situated in C:\Windows\system32\. If your files are there you can click twice on the .reg filesand import them.
Otherwise you should change the paths in jet40_engine.reg.