Valid 'extra' BSAs are omitted by Archive.GetApplicableArchivePaths

[SteveTownsend]

Mod has this

but the numbered ones are ignored by this code

log output for the loop:

Seems like a wildcard check is needed so that the extra ones are picked up. I believe it is safe to assume that order of BSA load within a single mod is immaterial - an installed mod with an internal BSA conflict is a broken mod or installation.

[SteveTownsend]

This seems to be the relevant code -> add a check for numeric decoration of the esp base-name, as well as type string e.g. My Mod - Textures.bsa is handles, My Mod1.bsa is not.
A work round for me is to rename any affected BSAs, so I am not blocked.

This logic will only ever include the first match, that may also be a problem depending on context.

[Noggog]

Do you know of all the variants of bsas that are "valid"? The logic currently says the ModKey is whatever the file name is... EXCEPT very specific carveouts.

Take this filesystem for ex:

ModA.esp
ModA2.esp
ModA.bsa
ModA2.bsa
ModA_2.bsa
ModABC.esp
ModABC.bsa

Does ModA2.bsa associate with both ModA.esp and ModA2.esp?
Does ModA_2.bsa associate with ModA.esp? Is it just numbers at the end that's viable, or anything that's a suffix?
Would ModABC.bsa associate with ModA.esp? ModA is a prefix of ModABC

I havent done enough research to know the actual logic involved in matching these things. I think we'd want to understand it for real before making the logic any more complex, if we can

[SteveTownsend]

This had crossed my mind. I confess I don't know what is considered valid. Do you have a source for the patterns that are valid, for future reference? The patcher in question contains some custom logic for prioritizing BSAs, to find the 'winning' file if there are conflicts in BSA contents. afaik I still cannot do this with Mutagen at this time. Let me know if that is incorrect and I will switch this to a canonical pattern. https://github.com/SteveTownsend/FaceGenChecker/blob/b303c76e2b12f2247bdb09d95630d9718043953d/FaceGenChecker/MeshHandler.cs#L572

…

On Fri, Jul 10, 2026 at 2:09 AM Justin Swanson ***@***.***> wrote: *Noggog* left a comment (Mutagen-Modding/Mutagen#675) <#675 (comment)> Do you know of all the variants of bsas that are "valid"? The logic currently says the ModKey is whatever the file name is... EXCEPT very specific carveouts. Take this filesystem for ex: ModA.esp ModA2.esp ModA.bsa ModA2.bsa ModA_2.bsa ModABC.esp ModABC.bsa Does ModA2.bsa associate with both ModA.esp and ModA2.esp? Does ModA_2.bsa associate with ModA.esp? Is it just numbers at the end that's viable, or anything that's a suffix? Would ModABC.bsa associate with ModA.esp? ModA is a prefix of ModABC — Reply to this email directly, view it on GitHub <#675?email_source=notifications&email_token=ADRDNC4YOSCXLNI6T5VGG4D5ECCAVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTGI2TANRUG43KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4932506476>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADRDNCYGKYCP43OPA4MAVWL5ECCAVAVCNFSNUABEKJSXA33TNF2G64TZHM4TOMJYGE4DAOJ3JFZXG5LFHM2DOOJYGQ3DSOBWGWQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ADRDNC64EI35CPGF3SLMULL5ECCAVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTGI2TANRUG43KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/ADRDNC5EFM2C7LSOHX6E4GL5ECCAVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTGI2TANRUG43KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[Noggog]

Some references after googling

Oblivion - Foo<sep>anything.bsa - Seems like it's fine with many suffixes
Fo3 - Foo <suffix>.bsa - Only space allowed as separator?
SkyrimLE - exact match only?
SkyrimSE, Fo4, Starfield - only - Suffix.bsa patterns?

But i have no clue how conclusive any of these sources are, or if they're just musing like us. Mo2 lists those BSAs as applicable, but is it even accurate itself? No clue.

Do you think those MyMod2.bsa patterns were actually loading in game for you? If so, that suggests those references above are lying and unreliable

[SteveTownsend]

Do you think those MyMod2.bsa patterns were actually loading in game for

you? I think so, specifically the Modpocalypse Skyrim SE Overhaul works OK I do agree this is best resolved by simply renaming BSAs that lie outside your strict pattern. My custom code works OK for me, but will break in some of the cases you described.

…

On Fri, Jul 10, 2026 at 2:29 PM Justin Swanson ***@***.***> wrote: *Noggog* left a comment (Mutagen-Modding/Mutagen#675) <#675 (comment)> Some references after googling Oblivion <https://en.uesp.net/wiki/Oblivion_Mod:BSAs_and_Archive_Invalidation> - Fooanything.bsa - Seems like it's fine with many suffixes Fo3 <https://geckwiki.com/index.php/BSA_Files> - Foo .bsa - Only space allowed as separator? SkyrimLE <https://www.gamesas.com/bsas-and-you-t257315.html> - exact match only? SkyrimSE <https://modding.wiki/en/skyrim/users/bethesda-archives>, Fo4 <https://forums.nexusmods.com/topic/9489288-about-archive-naming-conventions/>, Starfield <https://github.com/ejams1/starfield-modding-guide> - only - Suffix.bsa patterns? But i have no clue how conclusive any of these sources are, or if they're just musing like us. Mo2 lists those BSAs as applicable, but is it even accurate itself? No clue. Do you think those MyMod2.bsa patterns were actually loading in game for you? If so, that suggests those references above are lying and unreliable — Reply to this email directly, view it on GitHub <#675?email_source=notifications&email_token=ADRDNC3ZU2752D6KDEOX7RT5EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4938355148>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADRDNC42BV6YO7I2YWGHLTD5EEY2HAVCNFSNUABEKJSXA33TNF2G64TZHM4TOMJYGE4DAOJ3JFZXG5LFHM2DOOJYGQ3DSOBWGWQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ADRDNC22MHUSDGMUDG6EYLD5EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/ADRDNC4GUEWL6UT33ON6N435EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[SteveTownsend]

I have pretty big LOs for FNV/TTW, Oblivion, FO4 and SSE - I will review what's in each of those BSA inventories. On Fri, Jul 10, 2026 at 2:39 PM Steve Townsend ***@***.***> wrote:

…

> Do you think those MyMod2.bsa patterns were actually loading in game for you? I think so, specifically the Modpocalypse Skyrim SE Overhaul works OK I do agree this is best resolved by simply renaming BSAs that lie outside your strict pattern. My custom code works OK for me, but will break in some of the cases you described. On Fri, Jul 10, 2026 at 2:29 PM Justin Swanson ***@***.***> wrote: > *Noggog* left a comment (Mutagen-Modding/Mutagen#675) > <#675 (comment)> > > Some references after googling > > Oblivion > <https://en.uesp.net/wiki/Oblivion_Mod:BSAs_and_Archive_Invalidation> - > Fooanything.bsa - Seems like it's fine with many suffixes > Fo3 <https://geckwiki.com/index.php/BSA_Files> - Foo .bsa - Only space > allowed as separator? > SkyrimLE <https://www.gamesas.com/bsas-and-you-t257315.html> - exact > match only? > SkyrimSE <https://modding.wiki/en/skyrim/users/bethesda-archives>, Fo4 > <https://forums.nexusmods.com/topic/9489288-about-archive-naming-conventions/>, > Starfield <https://github.com/ejams1/starfield-modding-guide> - only - > Suffix.bsa patterns? > > But i have no clue how conclusive any of these sources are, or if they're > just musing like us. Mo2 lists those BSAs as applicable, but is it even > accurate itself? No clue. > > Do you think those MyMod2.bsa patterns were actually loading in game for > you? If so, that suggests those references above are lying and unreliable > > — > Reply to this email directly, view it on GitHub > <#675?email_source=notifications&email_token=ADRDNC3ZU2752D6KDEOX7RT5EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4938355148>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/ADRDNC42BV6YO7I2YWGHLTD5EEY2HAVCNFSNUABEKJSXA33TNF2G64TZHM4TOMJYGE4DAOJ3JFZXG5LFHM2DOOJYGQ3DSOBWGWQXMAQ> > . > Triage notifications, keep track of coding agent tasks and review pull > requests on the go with GitHub Mobile for iOS > <https://github.com/notifications/mobile/ios/ADRDNC22MHUSDGMUDG6EYLD5EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> > and Android > <https://github.com/notifications/mobile/android/ADRDNC4GUEWL6UT33ON6N435EEY2HA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJTHAZTKNJRGQ4KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. > Download it today! > You are receiving this because you authored the thread.Message ID: > ***@***.***> >