Windows job file format -
Overview
On Windows a .JOB file specifies task configuration. A .JOB file consists of two main sections, fixed-length and variable-length.
Fixed-length section
The fixed-length section is 68 bytes in size and consists of:
offset
size
value
description
0
	
2
		
Product version
	
2
	
2
	
1
	
File (format) version
	
4
	
16
		
Job UUID (or GUID)
	
20
	
2
		
Application name size offset
The offset is relative from the start of the file.
	
22
	
2
		
Trigger offset
The offset is relative from the start of the file.
	
24
	
2
		
Error Retry Count
	
26
	
2
		
Error Retry Interval
	
28
	
2
		
Idle Deadline
	
30
	
2
		
Idle Wait
	
32
	
4
		
Priority
	
36
	
4
		
Maximum Run Time
	
40
	
4
		
Exit Code
	
44
	
4
		
Status
	
48
	
4
		
Flags
	
52
	
16
		
Last run time
Consists of a SYSTEMTIME
	
Product version
Value Identifier Description 
0x0400		Windows NT 4.0	
0x0500		Windows 2000	
0x0501		Windows XP	
0x0600		Windows Vista	
0x0601		Windows 7	
0x0602		Windows 8	
0x0603		Windows 8.1	
0x0a00		Windows 10	
Priority
Value Identifier Description 
0x00800000	REALTIME_PRIORITY_CLASS	The task can run at the highest possible priority. The threads of a real-time priority class process preempt the threads of all other processes, including operating system processes performing important tasks.	
0x01000000	HIGH_PRIORITY_CLASS	The task performs time-critical tasks that can be executed immediately for it to run correctly. The threads of a high-priority class process preempt the threads of normal or idle priority class processes.	
0x02000000	IDLE_PRIORITY_CLASS	The task can run in a process whose threads run only when the machine is idle, and are preempted by the threads of any process running in a higher priority class.	
0x04000000	NORMAL_PRIORITY_CLASS	The task has no special scheduling requirements.	
Status
Value Identifier Description 
0x00041300	SCHED_S_TASK_READY	Task is not running but is scheduled to run at some time in the future.	
0x00041301	SCHED_S_TASK_RUNNING	Task is currently running.	
0x00041305	SCHED_S_TASK_NOT_SCHEDULED	The task is not running and has no valid triggers.	
Flags
See: Flags
SYSTEMTIME
offset size value description 
0	2		Year	
2	2		Month	
4	2		Weekday	
6	2		Day	
8	2		Hour	
10	2		Minute	
12	2		Second	
14	2		Milli second	
Variable-length section
The variable-length section is variable in size and consists of:
offset
size
value
description
0
	
2
		
Running Instance Count
	
2
	
...
		
Application Name
Consists of a Unicode string.
	
...
	
...
		
Parameters
Consists of a Unicode string.
	
...
	
...
		
Working Directory
Consists of a Unicode string.
	
...
	
...
		
Author
Consists of a Unicode string.
	
...
	
...
		
Comment
Consists of a Unicode string.
	
...
	
...
		
User Data
	
...
	
...
		
Reserved Data
	
...
	
...
		
Triggers
	
...
	
...
		
Job Signature
	
These values are stored as Unicode strings.
Unicode string
offset
size
value
description
0
	
2
		
Number of characters
The value will be 0 if the string is empty.
	
2
	
...
		
String
UTF-16 little-endian with end-of-string character
	
User Data
offset size value description 
0	2		data size	
2	...		data	
Reserved Data
The Reserved Data is similar in structure as the User Data though if a size is set, is should be 8 and the Reserved Data consists of:
offset size value description 
0	2	8	data size	
2	4		Start Error	
6	4		Task Flags	
Triggers
offset size value description 
0	2		Number of triggers	
2	...		Array of triggers	
Trigger
offset size value description 
0	2		Trigger Size	
2	2		Reserved1	
4	2		Begin Year	
6	2		Begin Month	
8	2		Begin Day	
10	2		End Year	
12	2		End Month	
14	2		End Day	
16	2		Start Hour	
18	2		Start Minute	
20	4		Minutes Duration	
24	4		Minutes Interval	
28	4		Flags	
32	4		Trigger Type	
36	2		TriggerSpecific0	
38	2		TriggerSpecific1	
40	2		TriggerSpecific2	
42	2		Padding	
44	2		Reserved2	
46	2		Reserved3	
Trigger type
Value Identifier Description 
0x00000000	ONCE	Not used	
0x00000001	DAILY		
0x00000002	WEEKLY		
0x00000003	MONTHLYDATE		
0x00000004	MONTHLYDOW		
0x00000005	EVENT_ON_IDLE	Not used	
0x00000006	EVENT_AT_SYSTEMSTART	Not used	
0x00000007	EVENT_AT_LOGON	Not used	
Job Signature
offset size value description 
0	2	1	Signature version	
2	2	1	Minimum client version	
4	64		Signature	
See Also
Windows
External Links
.JOB File Format, by Microsoft