File Name Directory Entry

Offset

Size

Description

Comments

0 (0x00)

1

EntryType

0xC1

1 (0x01)

1

GeneralSecondaryFlags

 

Bits

Size

Attribute

Comments

0 1

AllocationPossible

Must be 0

1 1

NoFatChain

Must be 0

2 14

CustomDefined

 

2 (0x02)

30

FileName

 

File Name directory entries must immediately follow the Steam Extension directory entry in the number of NameLength/15 rounded up.

The maximum number of File Name entries is 17, each can hold up to 15 Unicode characters and the maximum file name length is 255. Unused portion of FileName field must be set to 0x0000.

 

Invalid File Name Characters

Character Code

Character

Description

0x0000 – 0x001F

 

Control codes

0x0022

"

Quotation mark

0x002A

*

Asterisk

0x002F

/

Forward slash

0x003A

:

Colon

0x003C

<

Less than

0x003E

>

Greater than

0x003F

?

Question mark

0x005C

\

Back slash

0x007C

|

Vertical bar

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