Hello Snorri
Do you mean 4FD files designed with studio ?
Did you try the studio command line utility provided with studio : gsform
oim@venezia:~/bin/gst/bin
$ ./gsform --help
Usage: gsform [operation] [options] file1[.4fd] file2[.4fd] ...
Operation (compile by default)
-h : Display this help
-m : extract localized messages
-V : Version information
-c : convert old format 4fd files to new format
Options
-i : Ignore (overwrite) existing .per file
-M : display messages
-keep : Keep intermediate created .per file
-dbname name : dbname to use for form compilation
Option -keep should be what you are looking for.