Most of the time, you can launch the iMPACT tool from within ISE successfully. However, in some cases, you might experience iMPACT crash or errors as follows:
"_impact.exe has encountered a problem and needs to close."
"_impact.exe has stopped working"
" ERROR:ProjectRepository:14 - Unable to create temporary directory <C:\<path>/tmp/ipf> for storing project file contents
INFO:iMPACT:2643 - Could not open <name>.ipf"