>>The brute force approach could be to open the MPP file using the LLFF and read the first 5000 bytes of the file. The string "Microsoft Project 9.0" will be there for Project 2000. "Microsoft Project 8.0" will be there for Project 98.
>>
>>HTH.
>
>This code seemed to work OK:
>

>lcheck = FILETOSTR('C:\Temp\Project2.mpp')
>llcontinue = .F.
>FOR i = 1 TO 6000
>  IF UPPER(SUBSTR(lcheck,i,17)) = 'MICROSOFT PROJECT'
>    lcFound = SUBSTR(lcheck,i,21)
>    EXIT
>  ENDIF
>ENDFOR
>
>IF NOT EMPTY(lcFound)
>  RETURN(lcFound)
>ELSE
>  RETURN('Unknown')
>ENDIF
>

The probable reason Larry was asking about performance is the size of the project, and the For/Next loop. The size can be neglected, if you use just the first 6000 bytes, and the speed will improve if you use no loop:

nGFH = fopen('C:\Temp\Project2.mpp')
lcCheck=fread(nGFH, 6000)
fclose(nGFH)
lFound = .F.
#define C_MSP 'MICROSOFT PROJECT'
FOR i = 1 TO occurs(c_msp, lcCheck)
  nFoundAt=atc(c_msp, lcCheck) 
  if "8.0" $ substr(lcCheck,i,21)
    lFound=.t.
    EXIT
  ENDIF
ENDFOR
return lFound
ENDIF

This should be faster.