I decided to extract this game in the hopes it might be using nif files but it is not
It seems to be using a very simple file format but I do not recognize it.
Here is an extractor script.
idstring "RVP\0"
get VERSION long
get FILES short #not 100% correct but extracts every file"
getdstring UNKOWN1 5
goto 816139279
for i = 0 < FILES
get NAMESIZE long
getdstring NAME NAMESIZE
getdstring COMPRESSED 1
get OFFSET long
get ZSIZE long
get SIZE long
clog NAME OFFSET ZSIZE SIZE
next i
you should upload the beginning and the end of one of these archives.
judging the "Goto" you used I guess that the name table is at the end of the archive
idstring "RVP\0\0\0\0"
get INFO_OFF long
get INFO_END long
goto INFO_OFF
math INFO_END += INFO_OFF
for INFO_OFF = INFO_OFF < INFO_END
get NAMESIZE long
getdstring NAME NAMESIZE
get ZIP byte
get OFFSET long
get ZSIZE long
get SIZE long
savepos INFO_OFF
if ZIP == 1
clog NAME OFFSET ZSIZE SIZE
else
log NAME OFFSET SIZE
endif
next