Thanks - the command line doesn't give any output (am I supposed to replace the ... with something? Apologies if I'm being stupid)

The output is in the .txt file, you're supposed to replace the ...perl.exe... parts with the program you run,

if you run perl.exe foo.pl

then the command you run is   depends.exe /c /f:1 /pb /ot:temp.txt  perl.exe foo.pl

when in doubt use absolute/full paths (C:\perl\bin\perl.exe or whatever)

depends.exe will tell you what .exe/.dll is loading what .exe/.dll and which one is failing and why

if its not clear why/what then post the contents of temp.txt here inside code tags