I tried:
Z:\>Mount E E:\Games\DOS
Drive E is mounted as local directory E:\Games\DOS
Z:\>Mount O O: -t cdrom
MSCDES installed.
Drive E is mounted as CDRom O:\
Z:\> Mount E E:\WL.exe
Directory E:\WL.exe doesn't exist.
Z:\> Mount E E:\Games\WL.exe
Directory E:\Games\WL.exe doesn't exist.
Z:\> Mount E E:\Games\DOS\WL.exe
Directory E:\Games\DOS\WL.exe doesn't exist.
Z:\> Mount E E:\Games\DOS\Wasteland\WL.exe
E:\Games\DOS\Wasteland\WL.exe isn't a directory.
E:\> Mount C E:\Games\WL.exe
Directory E:\WL.exe doesn't exist.
E:\> Mount C E:\Games\DOS\WL.exe
Directory E:\Games\WL.exe doesn't exist.
E:\> Mount C E:\Games\DOS\Wasteland\WL.exe
E:\Games\DOS\Wasteland\WL.exe isn't a directory.
Here are some details:
Directory of O:\10TH\.
GAMES <DIR> 10-03-1994 10:38
10TH 16 13-06-1993 20:04
10TH COM 852 14-10-1993 17:39
10TH CON 6,447 14-07-1993 9:14
10TH FLI 322,884 01-10-1993 6:33
6X6TEXT FON 1,422 21-03-1993 0:02
AAPLAY EXE 81,904 15-08-1989 3:03
BARD BIN 1,047 12-10-1993 5:56
BARD1 CON 16,012 23-06-1993 15:12
BARD2 CON 16,012 23-06-1993 15:12
BARD3 CON 16,012 23-06-1993 15:12
BARD4 CON 16,012 23-06-1993 15:12
BARDTITL CON 6,192 23-06-1993 15:12
BC BIN 1,047 12-10-1993 5:55
BC1 CON 16,012 23-06-1993 15:13
BC2 CON 16,012 23-06-1993 15:13
BC3 CON 16,012 23-06-1993 15:13
BC4 CON 16,012 23-06-1993 15:13
BCTITLE CON 12,062 25-06-1993 5:06
BY CON 580 25-09-1993 14:48
BYGAMERS CON 2,103 25-09-1993 17:23
CAST BIN 1,047 12-10-1993 5:56
CAST1 CON 16,012 14-07-1993 9:37
CAST2 CON 16,012 14-07-1993 9:38
CAST3 CON 16,012 14-07-1993 9:38
CAST4 CON 16,012 14-07-1993 9:38
CASTTIT CON 5,258 14-07-1993 9:16
DW BIN 1,047 12-10-1993 5:55
DW1 CON 16,012 23-06-1993 15:10
DW2 CON 16,012 23-06-1993 15:11
DW3 CON 16,012 23-06-1993 15:11
DW4 CON 16,012 23-06-1993 15:11
DWTITLE CON 10,587 23-06-1993 15:11
FILES DTA 5,780 15-11-1993 4:24
FOR CON 644 25-09-1993 14:49
GAMETEXT DTA 8,823 15-11-1993 4:24
HEAD01 BIN 1,047 25-08-1993 10:22
HEAD01 CON 4,212 27-10-1993 9:42
HEAD02 CON 4,212 27-10-1993 9:42
HEAD03 CON 4,212 12-10-1993 5:51
HEAD04 CON 4,212 27-10-1993 9:43
HEAD05 CON 4,212 27-10-1993 9:43
HEAD06 CON 4,212 12-10-1993 5:52
HEAD07 CON 4,212 27-10-1993 9:43
HEAD08 CON 4,212 27-10-1993 9:45
HEAD09 CON 4,212 27-10-1993 9:45
HEAD10 CON 4,212 27-10-1993 9:46
HEAD11 CON 4,212 27-10-1993 9:46
HEAD12 CON 4,212 27-10-1993 9:46
HEAD13 CON 4,212 27-10-1993 9:46
HEAD14 CON 4,212 27-10-1993 9:46
HEAD15 CON 4,212 27-10-1993 9:47
HEAD16 CON 4,212 27-10-1993 9:47
HEAD17 CON 4,212 27-10-1993 9:47
LIST BIN 1,047 02-11-1993 7:12
LIST1 CON 16,012 25-06-1993 5:12
LIST2 CON 16,012 14-07-1993 10:03
LIST3 CON 16,012 25-06-1993 5:12
LIST4 CON 16,012 02-11-1993 7:12
LOGO CON 14,180 10-08-1993 12:48
LORD BIN 1,047 12-10-1993 5:58
LORD1 CON 16,012 23-06-1993 15:07
LORD2 CON 16,012 23-06-1993 15:07
LORD3 CON 16,012 23-06-1993 15:08
LORD4 CON 16,012 23-06-1993 15:08
LORDTITL CON 5,752 23-06-1993 15:09
MAIN5 EXE 92,072 01-12-1993 23:40
MAIN6 EXE 92,038 07-03-1994 5:45
MIND BIN 1,047 12-10-1993 5:55
MIND1 CON 16,012 23-06-1993 15:14
MIND2 CON 16,012 23-06-1993 15:14
MIND3 CON 16,012 23-06-1993 15:14
MIND4 CON 16,012 23-06-1993 15:14
MINDTITL CON 6,732 23-06-1993 15:14
OOTW BIN 1,047 12-10-1993 5:56
OOTW1 CON 16,012 23-06-1993 15:08
OOTW2 CON 16,012 23-06-1993 15:08
OOTW3 CON 16,012 23-06-1993 15:08
OOTW4 CON 16,012 23-06-1993 15:08
OOTWTITL CON 7,136 23-06-1993 15:09
OPEN EXE 23,176 27-10-1993 10:10
PIC4 CON 17,076 08-09-1993 9:31
PIC5 CON 17,076 08-09-1993 9:32
PLAYTRAC EXE 15,167 09-08-1993 9:39
QUOTE1 DTA 4,324 15-11-1993 4:24
QUOTE10 DTA 2,540 15-11-1993 4:24
QUOTE2 DTA 4,330 15-11-1993 4:24
QUOTE3 DTA 1,805 15-11-1993 4:24
QUOTE4 DTA 2,886 15-11-1993 4:24
QUOTE5 DTA 1,802 15-11-1993 4:24
QUOTE6 DTA 3,248 15-11-1993 4:24
QUOTE7 DTA 2,885 15-11-1993 4:24
QUOTE8 DTA 2,164 15-11-1993 4:24
QUOTE9 DTA 1,442 15-11-1993 4:24
SELECT CON 45,463 25-09-1993 15:59
SELECT1 CON 2,332 25-09-1993 15:24
SELECT2 CON 3,532 25-09-1993 15:25
SELECT3 CON 2,268 25-09-1993 15:25
SELECT4 CON 2,332 25-09-1993 15:25
SELECT5 CON 3,532 25-09-1993 15:25
SELECT6 CON 2,268 25-09-1993 15:25
SELECT7 CON 2,332 23-09-1993 10:40
SELECT8 CON 3,532 25-09-1993 15:55
SELECT9 CON 2,268 23-09-1993 10:40
TASS BIN 1,047 12-10-1993 5:56
TASS1 CON 16,012 14-07-1993 9:38
TASS2 CON 16,012 14-07-1993 9:39
TASS3 CON 16,012 14-07-1993 9:39
TASS4 CON 16,012 14-07-1993 9:39
TASSTIT CON 9,616 14-07-1993 9:17
TITLE BIN 1,047 25-09-1993 13:31
TITLE1 CON 16,012 14-07-1993 9:37
TITLE2 CON 16,012 14-07-1993 9:37
TITLE3 CON 16,012 14-07-1993 9:37
TITLE4 CON 16,012 14-07-1993 9:37
TREK BIN 1,047 12-10-1993 5:57
TREK1 CON 16,012 23-06-1993 15:09
TREK2 CON 16,012 23-06-1993 15:09
TREK3 CON 16,012 23-06-1993 15:09
TREK4 CON 16,012 23-06-1993 15:10
TREKTITL CON 12,270 23-06-1993 15:10
TRY EXE 37,860 14-10-1993 18:06
WASTE BIN 1,047 12-10-1993 6:14
WASTE1 CON 16,012 12-10-1993 6:18
WASTE2 CON 16,012 12-10-1993 6:18
WASTE3 CON 16,012 12-10-1993 6:18
WASTE4 CON 16,012 12-10-1993 6:18
WASTETIT CON 3,927 23-06-1993 15:10
Directory of O:\10TH\GAMES\WL\.
ALLHTDS1 34,307 21-07-1992 11:32
ALLHTDS2 39,230 21-07-1992 11:32
ALLPICS1 105,866 21-07-1992 11:32
ALLPICS2 133,433 21-07-1992 11:32
COLORF FNT 5,504 21-07-1992 11:32
CURS 2,048 21-07-1992 11:32
END CPA 21,027 21-07-1992 11:33
GAME1 159,429 21-07-1992 11:34
GAME2 172,235 21-07-1992 11:33
IC0_9 WLF 1,280 21-07-1992 11:32
INFO 2 21-07-1992 11:32
MASKS WLF 320 21-07-1992 11:32
TITLE PIC 18,432 21-07-1992 11:32
TRANSTBL 800 21-07-1992 11:32
WL EXE 62,549 27-09-1993 8:13
WLA BIN 4,209 21-07-1992 11:32
Directory of O:\10TH\GAMES\WL\.
ALLHTDS1 34,307 21-07-1992 11:32
ALLHTDS2 39,230 21-07-1992 11:32
ALLPICS1 105,866 21-07-1992 11:32
ALLPICS2 133,433 21-07-1992 11:32
COLORF FNT 5,504 21-07-1992 11:32
CURS 2,048 21-07-1992 11:32
END CPA 21,027 21-07-1992 11:33
GAME1 159,429 21-07-1992 11:34
GAME2 172,235 21-07-1992 11:33
IC0_9 WLF 1,280 21-07-1992 11:32
INFO 2 21-07-1992 11:32
MASKS WLF 320 21-07-1992 11:32
TITLE PIC 18,432 21-07-1992 11:32
TRANSTBL 800 21-07-1992 11:32
WL EXE 62,549 27-09-1993 8:13
WLA BIN 4,209 21-07-1992 11:32