IDR - File is not valid PE

Question

I want to reverse old .exe file; I'm 90% sure it is Delphi (class names are being with 'T' => "TCommonDialog")

I can't load file into IDR (becouse it is not valid PE-executable?) jet still .exe works just fine and icon is showing just right.

I was trying to maniupulate header but every time I just corrupt .exe

Header with MZ:

00000000  4d 5a 00 01 01 00 00 00  08 00 10 00 ff ff 08 00  |MZ..............|
00000010  00 01 00 00 00 00 00 00  40 00 00 00 00 00 00 00  |........@.......|
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 01 00 00  |................|
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000060  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000080

Further is longer header, but with NE; I was trying to change it to PE. At this point I don't know what am I doing, I just mess with everything

00000000  4e 45 06 01 17 07 5a 00  00 00 00 00 0a 03 16 00  |NE....Z.........|
00000010  00 20 00 40 0e 00 01 00  00 00 16 00 16 00 0c 00  |. .@............|
00000020  0e 00 40 00 f0 00 9f 06  a9 06 c1 06 71 08 00 00  |..@.........q...|
00000030  0e 00 04 00 00 00 02 00  00 00 00 00 00 00 0a 03  |................|
00000040  e4 36 cc 3d 10 1d cd 3d  e5 3a 47 3e 10 1d 47 3e  |.6.=...=.:G>..G>|
00000050  d3 3e 6f 3f 10 1d 70 3f  d6 42 96 3f 10 1d 97 3f  |.>o?..p?.B.?...?|
00000060  d9 46 20 3a 10 1d 21 3a  8f 4a 09 33 10 1d 0a 33  |.F :..!:.J.3...3|
00000070  cd 4d 99 30 10 1d 9a 30  df 50 1c 33 10 1d 1c 33  |.M.0...0.P.3...3|
00000080  17 54 7b 9a 10 1d 7b 9a  d3 5d 33 3c 10 1d 33 3c  |.T{...{..]3<..3<|
00000090  90 00 17 3a 50 1d 17 3a  57 04 c1 2f 50 1d c1 2f  |...:P..:W../P../|
000000a0  5b 07 2c 41 50 1d 2d 41  77 0b b9 66 50 1d ba 66  |[.,AP.-Aw..fP..f|
000000b0  f5 11 28 70 50 1d 28 70  1f 19 cc 22 50 1d cc 22  |..(pP.(p..."P.."|
000000c0  55 1b 00 6f 50 1d 00 6f  6c 22 84 7a 50 1d 85 7a  |U..oP..ol".zP..z|
000000d0  45 2a 31 51 50 1d 31 51  65 2f 8d 30 50 0d 8d 30  |E*1QP.1Qe/.0P..0|
000000e0  99 32 c6 1f 50 0d c6 1f  eb 34 5d 1f 59 0d 8c 2f  |.2..P....4].Y../|
000000f0  04 00 03 80 01 00 00 00  00 00 a9 61 30 00 10 1c  |...........a0...|
00000100  01 80 00 00 00 00 0e 80  01 00 00 00 00 00 d9 61  |...............a|
00000110  10 00 10 1c e4 03 00 00  00 00 0a 80 18 00 00 00  |................|
00000120  00 00 e9 61 30 00 30 1c  ed 03 00 00 00 00 19 62  |...a0.0........b|
00000130  10 11 30 1c f1 03 00 00  00 00 29 73 80 04 30 1c  |..0.......)s..0.|
00000140  fb 03 00 00 00 00 a9 77  40 00 30 1c 04 04 00 00  |.......w@.0.....|
00000150  00 00 e9 77 f0 04 30 1c  11 04 00 00 00 00 d9 7c  |...w..0........||
00000160  30 00 30 1c 1c 04 00 00  00 00 09 7d 80 00 30 1c  |0.0........}..0.|
00000170  25 04 00 00 00 00 89 7d  e0 00 30 1c 39 04 00 00  |%......}..0.9...|
00000180  00 00 69 7e 40 00 30 1c  48 04 00 00 00 00 a9 7e  |..i~@.0.H......~|
00000190  c0 01 30 1c 54 04 00 00  00 00 69 80 d0 05 30 1c  |..0.T.....i...0.|
000001a0  5b 04 00 00 00 00 39 86  50 00 30 1c 65 04 00 00  |[.....9.P.0.e...|
000001b0  00 00 89 86 60 00 30 1c  72 04 00 00 00 00 e9 86  |....`.0.r.......|
000001c0  50 00 30 1c 80 04 00 00  00 00 39 87 50 00 30 1c  |P.0.......9.P.0.|
000001d0  8f 04 00 00 00 00 89 87  40 00 30 1c 9c 04 00 00  |........@.0.....|
000001e0  00 00 c9 87 50 00 30 1c  a9 04 00 00 00 00 19 88  |....P.0.........|
000001f0  40 00 30 1c b6 04 00 00  00 00 59 88 50 00 30 1c  |@.0.......Y.P.0.|
00000200  c3 04 00 00 00 00 a9 88  50 00 30 1c d1 04 00 00  |........P.0.....|
00000210  00 00 f9 88 50 00 30 1c  de 04 00 00 00 00 49 89  |....P.0.......I.|
00000220  40 00 30 1c eb 04 00 00  00 00 89 89 70 01 30 1c  |@.0.........p.0.|
00000230  f8 04 00 00 00 00 f9 8a  90 00 30 1c 00 05 00 00  |..........0.....|
00000240  00 00 02 80 17 00 00 00  00 00 89 8b 10 00 30 1c  |..............0.|
00000250  05 05 00 00 00 00 99 8b  10 00 30 1c 0d 05 00 00  |..........0.....|
00000260  00 00 a9 8b 10 00 30 1c  18 05 00 00 00 00 b9 8b  |......0.........|
00000270  10 00 30 1c 1f 05 00 00  00 00 c9 8b 10 00 30 1c  |..0...........0.|
00000280  29 05 00 00 00 00 d9 8b  10 00 30 1c 33 05 00 00  |).........0.3...|
00000290  00 00 e9 8b 10 00 30 0c  3c 05 00 00 00 00 f9 8b  |......0.<.......|
000002a0  10 00 30 0c 45 05 00 00  00 00 09 8c 10 00 30 1c  |..0.E.........0.|
000002b0  4c 05 00 00 00 00 19 8c  10 00 30 1c 51 05 00 00  |L.........0.Q...|
000002c0  00 00 29 8c 10 00 30 1c  57 05 00 00 00 00 39 8c  |..)...0.W.....9.|
000002d0  10 00 30 1c 5c 05 00 00  00 00 49 8c 10 00 30 1c  |..0.\.....I...0.|
000002e0  63 05 00 00 00 00 59 8c  20 00 30 1c 68 05 00 00  |c.....Y. .0.h...|
000002f0  00 00 79 8c 20 00 30 1c  6f 05 00 00 00 00 99 8c  |..y. .0.o.......|
00000300  20 00 30 1c 74 05 00 00  00 00 b9 8c 20 00 30 1c  | .0.t....... .0.|
00000310  79 05 00 00 00 00 d9 8c  20 00 30 1c 7f 05 00 00  |y....... .0.....|
00000320  00 00 f9 8c 20 00 30 1c  88 05 00 00 00 00 19 8d  |.... .0.........|
00000330  20 00 30 1c 90 05 00 00  00 00 39 8d 20 00 30 1c  | .0.......9. .0.|
00000340  98 05 00 00 00 00 59 8d  20 00 30 1c 9e 05 00 00  |......Y. .0.....|
00000350  00 00 79 8d 20 00 30 1c  a6 05 00 00 00 00 01 80  |..y. .0.........|
00000360  06 00 00 00 00 00 99 8d  20 00 30 1c 01 80 00 00  |........ .0.....|
00000370  00 00 c9 8d 20 00 30 1c  02 80 00 00 00 00 f9 8d  |.... .0.........|
00000380  20 00 30 1c 03 80 00 00  00 00 29 8e 20 00 10 1c  | .0.......). ...|
00000390  04 80 00 00 00 00 59 8e  20 00 10 1c 05 80 00 00  |......Y. .......|
000003a0  00 00 89 8e 20 00 30 1c  06 80 00 00 00 00 0c 80  |.... .0.........|
000003b0  06 00 00 00 00 00 b9 8d  10 00 30 1c fb ff 00 00  |..........0.....|
000003c0  00 00 e9 8d 10 00 30 1c  fc ff 00 00 00 00 19 8e  |......0.........|
000003d0  10 00 30 1c fd ff 00 00  00 00 49 8e 10 00 30 1c  |..0.......I...0.|
000003e0  fe ff 00 00 00 00 79 8e  10 00 30 1c ff ff 00 00  |......y...0.....|
000003f0  00 00 a9 8e 10 00 30 1c  fa ff 00 00 00 00 06 80  |......0.........|
00000400  11 00 00 00 00 00 b9 8e  20 00 30 1c 01 8f 00 00  |........ .0.....|
00000410  00 00 d9 8e 20 00 30 1c  02 8f 00 00 00 00 f9 8e  |.... .0.........|
00000420  20 00 30 1c 03 8f 00 00  00 00 19 8f 20 00 30 1c  | .0......... .0.|
00000430  04 8f 00 00 00 00 39 8f  20 00 30 1c 05 8f 00 00  |......9. .0.....|
00000440  00 00 59 8f 20 00 30 1c  06 8f 00 00 00 00 79 8f  |..Y. .0.......y.|
00000450  20 00 30 1c 07 8f 00 00  00 00 99 8f 10 00 30 1c  | .0...........0.|
00000460  08 8f 00 00 00 00 a9 8f  10 00 30 1c 09 8f 00 00  |..........0.....|
00000470  00 00 b9 8f 20 00 30 1c  0a 8f 00 00 00 00 d9 8f  |.... .0.........|
00000480  20 00 30 1c 0b 8f 00 00  00 00 f9 8f 20 00 30 1c  | .0......... .0.|
00000490  f9 8f 00 00 00 00 19 90  20 00 30 1c fa 8f 00 00  |........ .0.....|
000004a0  00 00 39 90 10 00 30 1c  fb 8f 00 00 00 00 49 90  |..9...0.......I.|
000004b0  10 00 30 1c fd 8f 00 00  00 00 59 90 10 00 30 1c  |..0.......Y...0.|
000004c0  fe 8f 00 00 00 00 69 90  10 00 30 1c ff 8f 00 00  |......i...0.....|
000004d0

Answer 1

If you look at the information provided by fileformat.info , you'll see that this is very likely an NE executable. These also start with MZ , but the rest is different.

Reading the bytes at offsets 0000000C and 0000000D , this is probably a Windows 3.x Protected Mode program. If it is made with Delphi, that can only have been Delphi 1, which did not produce PE executables, but 16 bit Windows executables instead.