LoadFileInternal
         +LDADDR gPathname
         +STAY namlo                 ; set filename
         jsr   traverse              ; go to subdirectory, set up filename for read
         lda   #cmdread              ; read (instead of write)
         sta   reqcmd
         lda   #0                    ; 0 = read into main memory
         sta   auxreq
         lda   ldrlo+1
         bne   +                     ; if caller provided a load address, use it
         sta   sizelo                ; otherwise query the load address from file metadata
         sta   sizehi                ; 0 = query load address
         jsr   hddopendir            ; call ProRWTS2
         +LDAY ldrlo2
         +STAY ldrlo
+        lda   #$FF                  ; read entire file (ProRWTS2 will figure out exact size)
         sta   sizehi
         jmp   hddopendir            ; exit via ProRWTS2

LoadDHRFileInternal
         +LDADDR gPathname
         +STAY namlo                 ; set filename
         jsr   traverse              ; go to subdirectory, set up filename for read
         lda   #$00                  ; read first $2000 bytes
         sta   sizelo
         sta   ldrlo
         lda   #$20
         sta   sizehi
         asl
         sta   ldrhi                 ; into $4000
         lda   #1                    ; 1 = read into aux memory
         sta   auxreq
         lda   #cmdread              ; read (instead of write)
         sta   reqcmd
         jsr   hddopendir            ; call ProRWTS2
         lda   #$20                  ; read next $2000 bytes
         sta   sizehi
         asl
         sta   ldrhi                 ; into $4000
         dec   auxreq                ; 0 = read into main memory
         clc                         ; not a subdirectory
         jmp   hddrdwrpart           ; call ProRWTS2

SaveSmallFileInternal
         +LDADDR gPathname
         +STAY namlo                 ; set filename for ProRWTS2
         jsr   traverse              ; go to subdirectory, set up filename for read
         ;;if the write address is always a fixed value then we can discard the query
         lda   #cmdread              ; read (instead of write)
         sta   reqcmd
         lda   #0                    ; 0 = read into main memory
         sta   sizelo
         sta   sizehi                ; 0 = query load address
         jsr   hddopendir            ; call ProRWTS2
         lda   ldrlo2
         sta   ldrlo
         lda   ldrhi2
         sta   ldrhi
         lda   #cmdwrite             ; write (instead of read)
         sta   reqcmd
         sta   sizehi                ; 512 bytes
         jmp   hddopendir            ; exit via ProRWTS2 (must re-open the file after query)