I didn't find that of much help but have gotten the code to work up to a point. I can now create a JPG file from the FoxPro General field. The problem now is getting Excel to accept the JPG file.
Here is the code that I have written with sigfile the General Field in table UserInfo1. This is a 1 record table.
COPY TO tempsig FIELDS userinfo1.sigfile NEXT 1
*** execute the following code, assuming the file name for the output JPG image is "TestSig.JPG":
*** Open two files, "UserInfo1.fpt" contains the physical JPG data.
*** and Create a file handle for the output file "TestSig.JPG"
handlein = FOPEN("TempSig.fpt"

handleout = FCREATE("testsig.jpg"
*** To determine the length of the Input file "TempSig.fpt"
gnEnd = FSEEK(handlein, 0, 2)
gnTop = FSEEK(handlein, 0)
*** Store the whole file into a string "str1"
str1 = FREAD(handlein, gnEnd)
*** Offset 599 bytes from Str1 and save it to "str2"
str2 = RIGHT(str1,LEN(str1)-599)
*** Write "Str2" into the JPG file "TestSig.JPG"
n = FWRITE(handleout,str2)
*** Close both opened files
=FCLOSE(handlein)
=FCLOSE(handleout)
toSheet.Range("C28"

.Value = TempSig.JPG