After creating a drawing recently in Acad2000 LT I tried to create a pdf using Adobe Acrobat 6. That process failed, presumably because Acrobat does not know about ACAD200LT. So I uninstalled ACAD LT and installed ACAD2000. I can now create pdf's but everytime I doubleclick to open a dwg file (either the one created in ACAD LT or others that were created previously with ACAD2000) from Windows Explorer I get an error box which says: 'Cannot find the file "C: ull path ilename" (or one of its components). Make sure that the path and filename are correct and that all required libraries are available.' The file opens correctly in spite of the error message and I can view edit etc. Note that if I open the file by starting Autocad and then selecting File-> Open I do not get the error message. This suggests that it is an Explorer problem. Does anyone have any suggestions about how to fix this?? Note that I have uninstalled ACAD2000 as well as Acrobat several times but to no avail. I am running Win2k on a 933 MHZ P3 with 512MB RAM. TIA, -GB